- Thread starter
- #61
PMMcivicFB2
Well-Known Member
Yeah me to. It's a scam. I get worse millage
Out of curiosity does your mileage get slightly better as it brakes in?
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- Start date
wondermalt
Well-Known Member
I noticed better mileage when I put in 89 over 87 octane gas.
The dollar/km is slightly better
The dollar/km is slightly better
I only use shell premo in my honda, always have and always will. Using the cheap stuff will cause premature wear on a lot of your internals, clog up your filters more quickly, and cause poor fuel mileage. I base my opinion off of tons of research I've done over the years on premo~vx~regular petrol and I know this to be true because if u drive a while on reggie~unleaded then switch to premo, you will notice it in the drive and the hum of the engine during warm~ups. Well...I can anyways, I've had huge debates over this lol
Dennis Rockholt
9k Alll Day
With this invidia exhaust and no tune....im not even gonna comment on my MPG 
Dennis Rockholt
9k Alll Day
I noticed better mileage when I put in 89 over 87 octane gas.
The dollar/km is slightly better
In an SI they tell you to only use premium..but with an LX I would think either is fine. But 93 is where its at!!
- Staff
- #67
This is incorrect. Only an Si requires premium (91+). All others require 87+ octane. Please read your manual a little more carefully before spreading incorrect information.
Please don't make me take a pic of my manual lmao I know what I read, good sir
I retract previous statement due to me remembering that my original manual was for an SI, my apologies.
I still think usuing cheap gas is bad for a honda engine, any of them
I retract previous statement due to me remembering that my original manual was for an SI, my apologies.
I still think usuing cheap gas is bad for a honda engine, any of them
Last edited:
- Staff
- #69
By all means do so.
All people need to do is use top tier gas and they will be fine.
andre12dbsi
Well-Known Member
There is lots of debate about the different octane levels. There was a news article a few months back where they talked about using premium fuel in cars that don't call for it and the fact that it's doing more harm then good.
Personally I stick with what the manual recommends.
Personally I stick with what the manual recommends.
- Staff
- #71
There is a single manual for all Civics with information for specific models noted where necessary.
- Staff
- #73
I have always like this FAQ from Click and Clack.
Q. My owner's manual says my car will run just fine on regular, unleaded gas. Will "treating" it to premium gas provide any benefit?
A. Let's be perfectly clear about this:
NO!
A. The only thing you'll be benefiting are the portfolios of impoverished oil company executives.
And before you do that, consider that Exxon-Mobil earned $39.5 billiondollars in 2006 - a world record profit. It's not like they need you giving them a hand out.
Q. But, won't premium increase the performance of my car's engine?
No.
A. Higher octane provides no additional performance for cars that are designed to run on regular gas.
Q. You're telling me I'm wasting my money by using premium?
A. You're starting to get the picture.
Q. Okay. My owner's manual does call for premium gas. Do I need to use it?
A. In that case, the answer isn't quite so clear. In a high-compression engine that's designed to run on premium fuel, premium will provide some additional power. But, if you want to save some money, you can probably still fill up with regular, unleaded fuel much of the time.
Q. How much will I save?
A. About 20-30 cents per gallon. For an average driver, that can run as high as high as $200 a year.
Q. So, why would my owner's manual calls for premium gas instead of regular?
A. Because your manufacturer decided to use what's known as a "high compression" engine.
An engine with a high compression ratio has some advantages. It squeezes more power of the same-size engine. But, it requires you to spend more for every tank of gas, to get that extra power. In other words, instead of manufacturing a car with a larger, but lower-compression-ratio engine, manufacturers are using high compression engines, and foisting the additional cost back to you - by forcing you to buy premium gas to get that extra performance.
Q. My owner's manual says that if I don't use premium, I might get engine pinging or knocking. Is that right?
A. It's possible, depending on the load you put on the engine.
Q. What is pinging or knocking?
A. They're noises, which are signs that the gas and air mixture in your car's cylinders isn't burning exactly as intended. The sound you hear is the result of the fuel and air mixture combusting unevenly in the cylinder.
Pinging or knocking will reduce the efficiency of your engine and, over a very long period of time, it can cause damage.
Q. How does it occur?
A. Let us show you! Here's what's going on in the cylinders inside the engine during pinging or knocking:
Illustration #1 The piston begins to move upwards during what's called the, "compression stroke," compressing a mixture of fuel and air.
________________________________________
Illustration #2 In a normally operating engine, the spark from the spark plug ignites the mixture of fuel and air, causing an extremely rapid burning of the fuel in the cylinder. That's good. It's what creates the pressure that makes the piston travel down very fast, causing the crankshaft, your transmission, and ultimately the wheels - to turn.
________________________________________
Illustration #3 However, it's possible for the mixture of gas and air to burn somewhere else in the cylinder, simply from the pressure (or compression) within the cylinder, and not from the spark. That's called "pre-ignition," and it's more likely in a high-compression engine.
________________________________________
Illustration #4 When the fire you want (that's the one from the spark plug), collides with the fire you don't want (that's the one resulting from the pre-ignition), the result is a ping or, if the pre-ignition fire is big enough, a knock. The degree of severity, including the amount of noise generated, is determined by how big that unwanted flame is.
Q. How does high-octane gas help?
A. Compared to regular gas, high-octane gas requires higher temperature and pressure to ignite, so it can withstand higher compression without reigniting. As such, it's less likely to result in premature ignition, and therefore prevents pinging and/or knocking.
In other words, it's a form of protection for high compression engines.
Q. So, I should use high-octane gas to prevent pinging?
A. High-octane gas will prevent pinging.
But these days most cars have something called a knock-sensor, that will - under many circumstances - obviate the need for premium gas. Just about any car that's more recent than about 1996 will have a knock sensor.
Q. How does a knock-sensor work?
A. The knock-sensor uses auditory detection to actually "hear" the knocking or pinging. When necessary, it uses this information to delay the spark and to minimize knocking or pinging.
That's good news. That means you can use gas with a lower octane rating. And, if your engine detects a knock or ping, it can usually adjust the timing of the spark until the knocking is gone.
Q. You're telling me that modern cars automatically detect this problem, and therefore won't ping?
A. Right - as long as the load is not too great.
Load is the amount of work you're asking the engine to do, and it's affected by a number of factors, including climbing steep hills, pulling heavy weight, hard acceleration or driving in hot weather. Any combination of these factors can affect load. So, if you live out in the desert Southwest, it's 115 degrees out and you're hauling your mother-in law up, you're going to need premium.
Why? Because there's only so much that your car's knock sensor and computer can do to adjust the engine's timing.
Q. Is it a big deal if my car pings for a few seconds here and there, under these circumstances?
A. No, it's not.
Q. So, are there any circumstances under which premium gas would be a good idea?
A. If you plan to haul that aforementioned mother-in-law in hot weather, or are going to be driving up monstrous mountain passes with a heavily laden car, then you might consider filling up with a tank of premium gas.
Q. But, under most normal operating conditions, do I lose anything if I use regular unleaded instead of premium?
A. In many cases, no, but you'll have to experiment with your own car. If you take our advice and drive judiciously - without lead-footing or overloading your car - and you don't hear pinging, you can use regular fuel. Of course, you'll lose that warm feeling of giving oil companies an average of 20-30 cents more per gallon of gas. And, you will lose performance that under most driving situations won't be noticeable.
Q. My owner's manual says my car will run just fine on regular, unleaded gas. Will "treating" it to premium gas provide any benefit?
A. Let's be perfectly clear about this:
NO!
A. The only thing you'll be benefiting are the portfolios of impoverished oil company executives.
And before you do that, consider that Exxon-Mobil earned $39.5 billiondollars in 2006 - a world record profit. It's not like they need you giving them a hand out.
Q. But, won't premium increase the performance of my car's engine?
No.
A. Higher octane provides no additional performance for cars that are designed to run on regular gas.
Q. You're telling me I'm wasting my money by using premium?
A. You're starting to get the picture.
Q. Okay. My owner's manual does call for premium gas. Do I need to use it?
A. In that case, the answer isn't quite so clear. In a high-compression engine that's designed to run on premium fuel, premium will provide some additional power. But, if you want to save some money, you can probably still fill up with regular, unleaded fuel much of the time.
Q. How much will I save?
A. About 20-30 cents per gallon. For an average driver, that can run as high as high as $200 a year.
Q. So, why would my owner's manual calls for premium gas instead of regular?
A. Because your manufacturer decided to use what's known as a "high compression" engine.
An engine with a high compression ratio has some advantages. It squeezes more power of the same-size engine. But, it requires you to spend more for every tank of gas, to get that extra power. In other words, instead of manufacturing a car with a larger, but lower-compression-ratio engine, manufacturers are using high compression engines, and foisting the additional cost back to you - by forcing you to buy premium gas to get that extra performance.
Q. My owner's manual says that if I don't use premium, I might get engine pinging or knocking. Is that right?
A. It's possible, depending on the load you put on the engine.
Q. What is pinging or knocking?
A. They're noises, which are signs that the gas and air mixture in your car's cylinders isn't burning exactly as intended. The sound you hear is the result of the fuel and air mixture combusting unevenly in the cylinder.
Pinging or knocking will reduce the efficiency of your engine and, over a very long period of time, it can cause damage.
Q. How does it occur?
A. Let us show you! Here's what's going on in the cylinders inside the engine during pinging or knocking:
Illustration #1 The piston begins to move upwards during what's called the, "compression stroke," compressing a mixture of fuel and air.
________________________________________
Illustration #2 In a normally operating engine, the spark from the spark plug ignites the mixture of fuel and air, causing an extremely rapid burning of the fuel in the cylinder. That's good. It's what creates the pressure that makes the piston travel down very fast, causing the crankshaft, your transmission, and ultimately the wheels - to turn.
________________________________________
Illustration #3 However, it's possible for the mixture of gas and air to burn somewhere else in the cylinder, simply from the pressure (or compression) within the cylinder, and not from the spark. That's called "pre-ignition," and it's more likely in a high-compression engine.
________________________________________
Illustration #4 When the fire you want (that's the one from the spark plug), collides with the fire you don't want (that's the one resulting from the pre-ignition), the result is a ping or, if the pre-ignition fire is big enough, a knock. The degree of severity, including the amount of noise generated, is determined by how big that unwanted flame is.
Q. How does high-octane gas help?
A. Compared to regular gas, high-octane gas requires higher temperature and pressure to ignite, so it can withstand higher compression without reigniting. As such, it's less likely to result in premature ignition, and therefore prevents pinging and/or knocking.
In other words, it's a form of protection for high compression engines.
Q. So, I should use high-octane gas to prevent pinging?
A. High-octane gas will prevent pinging.
But these days most cars have something called a knock-sensor, that will - under many circumstances - obviate the need for premium gas. Just about any car that's more recent than about 1996 will have a knock sensor.
Q. How does a knock-sensor work?
A. The knock-sensor uses auditory detection to actually "hear" the knocking or pinging. When necessary, it uses this information to delay the spark and to minimize knocking or pinging.
That's good news. That means you can use gas with a lower octane rating. And, if your engine detects a knock or ping, it can usually adjust the timing of the spark until the knocking is gone.
Q. You're telling me that modern cars automatically detect this problem, and therefore won't ping?
A. Right - as long as the load is not too great.
Load is the amount of work you're asking the engine to do, and it's affected by a number of factors, including climbing steep hills, pulling heavy weight, hard acceleration or driving in hot weather. Any combination of these factors can affect load. So, if you live out in the desert Southwest, it's 115 degrees out and you're hauling your mother-in law up, you're going to need premium.
Why? Because there's only so much that your car's knock sensor and computer can do to adjust the engine's timing.
Q. Is it a big deal if my car pings for a few seconds here and there, under these circumstances?
A. No, it's not.
Q. So, are there any circumstances under which premium gas would be a good idea?
A. If you plan to haul that aforementioned mother-in-law in hot weather, or are going to be driving up monstrous mountain passes with a heavily laden car, then you might consider filling up with a tank of premium gas.
Q. But, under most normal operating conditions, do I lose anything if I use regular unleaded instead of premium?
A. In many cases, no, but you'll have to experiment with your own car. If you take our advice and drive judiciously - without lead-footing or overloading your car - and you don't hear pinging, you can use regular fuel. Of course, you'll lose that warm feeling of giving oil companies an average of 20-30 cents more per gallon of gas. And, you will lose performance that under most driving situations won't be noticeable.
Dennis Rockholt
9k Alll Day
Simply put, if your engine is not designed for it, it wont do you any good
Monk
Well-Known Member
What we need to pay attention to is that the gas station does a high volume of cars, that insures the underground tanks are being recycled and not building up sludge and water.
High tier is the use of gas that has quality additives mixed into the gas, NO MATTER IF IT'S HIGH-TEST OR REGULAR.
And as has been stated by those in the know, does no good to use high test in a car that only requires regular.
Thank you @squiggy , for bringing to light the correct use of octane, that never seems to stop getting bashed by the Pro(high)testers(pun intended)........
No harm, no foul to @Brandt, we all have gotten this disinformation fed to us.
(Misinformation that is deliberately disseminated in order to influence or confuse rivals (foreign enemies or business competitors etc.)
High tier is the use of gas that has quality additives mixed into the gas, NO MATTER IF IT'S HIGH-TEST OR REGULAR.
And as has been stated by those in the know, does no good to use high test in a car that only requires regular.
Thank you @squiggy , for bringing to light the correct use of octane, that never seems to stop getting bashed by the Pro(high)testers(pun intended)........
No harm, no foul to @Brandt, we all have gotten this disinformation fed to us.
(Misinformation that is deliberately disseminated in order to influence or confuse rivals (foreign enemies or business competitors etc.)
edd
Well-Known Member
Did you get the car with less than 50 miles when you bought it?
wondermalt
Well-Known Member
Happened to find this chart for Octane vs Compression Ratios
http://vintagesleds.com/bs/index.php?topic=77538.0
http://vintagesleds.com/bs/index.php?topic=77538.0
- Staff
- #78
- Thread starter
- #79
PMMcivicFB2
Well-Known Member
So much better than what I was getting in the winter
I just got an oil change and refilled my gas yesterday. My Ex is at 6900 miles now and my last tank got me 36.8 mpg with Econ off according to my trip computer. I drive about 70% highway/30% city. Been using 89 octane ever since I got the car. I have a feeling the warm weather has more to do with my increased MPG. My car was getting about 33-34 mpg in the winter months driving the same routes.