Decreasing MPG

[grandepau00]

Up until two weeks ago I was averaging 18.6 mpgs. Then I put two brand new front tires on, full synthetic oil change (which is what I always use), and replaced my k&n (cone) filter with a recharged one. I also added a bottle of injector cleaner. Since then ive been thru two tanks of gas and the first one was 17.3 mpg and the second was 17.6. Maybe the injector cleaner messed something up? Maybe its the warmer weather? I always use sunoco 93 octane. Car has 60000 miles, factory 3.55's, stock tire size and stock tune. And I haven't changed my driving style. Any ideas as to why the fuel mileage is going down?

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[fastblackmerc]

I wouldn't worry over 1 mpg......

[jwibbity]

you should be getting alot better than 18 with a almost stock MM, im lucky to get 18mpg even if i drive like a grandma:(

[marauderthis]

I get 20 - 21 mainly HWy

[JoeBoomz]

Ethanol blended gasoline will give lower gas mileage.