Monk
Well-Known Member
Yes the ones that do mix have a metering valve to give to proper amount of mid grade fuel........
Regular Vs. Premium Fuel
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trustdestruction
Well-Known Member
It is a blend but it is (usually) simply not the right octane (91+). I would not call that a good compromise.
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depending on the users geographic location, 91 octane could be their "premium", where other parts of the US have 93 as premium.
Scotty1981
Well-Known Member
I don't think the R18 requires 93 though, now for the SI you're right, that's another story.
Yup, 87 for the r18. I just 37.5mpg avg for my last tank. Thats on winter gas too with snow tires on.
trustdestruction
Well-Known Member
Right. Here in FL premium is usually 93, whereas 91 is rare but I do see some stations (rarely) with 91 octane premium as the top option. The typical FL gas station carries 87, 89, and 93. There's even a 7-eleven down the street from me that sells 87, 89, 91, and 93 ("super-premium"). 89 octane is pretty much always mid-grade here though, which is why I would say mid-grade ("plus") is not acceptable for our engines.
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Yeah ^...and as you travel west, it becomes next to impossible to find 93. Regular turns to 85 octane instead of 87 and so on.
trustdestruction
Well-Known Member
Interesting. Had no idea, especially about the 85 octane. Regardless though, west coast mid-grade "plus" isn't okay either then, it's even worse.
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Brooksie365
Well-Known Member
I usually run 91 but have noticed the Mobil sells 93. Is the 93 worth the extra 15 cents a mile?
Monk
Well-Known Member
What does your manual recommend ? If it's 91 then run 91.... The only time you might need a higher mix is if you suspect that the station you got it from has a slow turn over of traffic and that the ground gas isn't refreshed often enough for the octane to hold it's rating(old gas).
Internalaudit
Member
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Maybe I've got no right to post since I don't own an SI but we do have a 2011 Honda Accord EX-L coupe that should have a similar engine. What makes the 2.4L engine in the SI so different? Is the compression ratio a lot higher on the SI? The recommended fuel for our Accord is regular.
Stolen from wikipedia:
K24Z7
- Found in:
- 2012 Honda Civic Si (US)
- Displacement: 2,354 cc (143.6 cu in)
- Bore and Stroke: 87 mm x 99 mm (3.43 x 3.90 inches)
- Compression: 11.0:1
- Power: 201 HP @ 7000 rpm
- Torque: 170 lbs·ft @ 4400 rpm
- Redline: 7000 rpm
- Fuel Cutoff: 7200 rpm
- 2012 Honda Civic Si (US)
K24Z3
- Found in:
- 2008+ Honda Accord LX-S/EX/EX-L trim models (CP2, CS1)
- Displacement: 2,354 cc (143.6 cu in)
- Bore and Stroke: 87 mm x 99 mm (3.43 x 3.90 inches)
- Compression: 10.5:1
- Power: 190 hp @ 7000 rpm
- Torque: 162 lb·ft @ 4400 rpm
- Redline: 7100 rpm
- 2008+ Honda Accord LX-S/EX/EX-L trim models (CP2, CS1)
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The Si is at an 11.0:1 compression ratio versus 10.5:1. I'm sure the CR-V, which has the K24Z7 (same as Si) at 10.0:1 compression only requires regular, so the premium would be likely base tune and compression ratio.
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Brooksie365
Well-Known Member
On the same exact page as you. I owned a 2003 accord with a k24 and it was regular. I understand compression and that mumbo jumbo. I just think its strange that 3-4 octane makes that big of a difference. I test diesel for c tane every single fuel tanker we get before offloaded which is 3 times a week. The amount of c tane varies in every load but 2-7 with in spec is fine with the diesels and that's 30-1 compression. Gas is a different world to me and me no likey.
Mephist0
Well-Known Member
Shocked not to see Valero on the list. Guess I won't be shopping there anymore.
hotshot
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It's kinda misleading, Valero may not participate in the program, thus they wouldn't be on the list.
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valero is exxon,... and exxon is top tier.
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Brooksie365
Well-Known Member
What about gulf are they owned by any one?
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According to wiki
BP, Chevron, Cumberland Farms and other companies that acquired former Gulf operations continued to use the Gulf name through the early 1990s. This caused consumer confusion in the US retail market as the parent companies would not accept each other's credit cards. All former Gulf stations franchised by BP and Chevron in the United States have since been converted to those names.
BP, Chevron, Cumberland Farms and other companies that acquired former Gulf operations continued to use the Gulf name through the early 1990s. This caused consumer confusion in the US retail market as the parent companies would not accept each other's credit cards. All former Gulf stations franchised by BP and Chevron in the United States have since been converted to those names.
Mephist0
Well-Known Member
Other than Valero purchasing one of ExxonMobil's refinery's in California along with 350 Exxon stations, I can't find any relation between the two companies. They even trade under different stock symbols.