Drop in MPG, 2012 Civic EX-L

[McNaryGirl]

My MPG has dropped significantly in the last 6-9 months. I had been averaging 37-39 Mpg, but am now only getting 32-33. We have replaced the air filters and oil changes are up to date. The only other thing is that I have new tires, but they are properly inflated and I wouldn't have thought they would change the Mpg that much. Any ideas on what could be causing the drop?

 

[Darkout]

The amount of factors that could affect you are pretty significant whether it's driving habits, traffic, weather etc. Really hard to say honestly. How many miles on the vehicle?

 

[webby]

did you get the same brand/size of tire?

 

[NoMoreNissans]

if you live in a snowy part of the states or anywhere in Canada, the gas stations have been selling winter gas over the last 6 months. which gives worse MPGs

 

[tacthecat]

My MPG has dropped significantly in the last 6-9 months. I had been averaging 37-39 Mpg, but am now only getting 32-33. We have replaced the air filters and oil changes are up to date. The only other thing is that I have new tires, but they are properly inflated and I wouldn't have thought they would change the Mpg that much. Any ideas on what could be causing the drop?

As noted elsewhere winter & gas mix reduce our Si mileage almost 3 mpg - new tires (same type as oem - mx4s) cost us another 1 mpg for the first 15k miles but it's gradually increasing.
It costs our '98 Civic 5 mpg Summer to Winter.