Gas milage/bigger heavier wheels

Lownslowlsc

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Well i'm curious. When i had my 19's on last summer my comp was reading 14-14.5 city mpg( thought i had mpg probs). I'm rocking the stocks now and see around 17-18city. Now i know i shouldn't go by what the comp says but im using this as an example..

Would the change in mpg's on the comp be becuase the 19's are a bit taller?1.6mph faster then stock wheels when traveling 60mph via the tire size calculator.
Or would it be becuase there heavier..

I know plenty of you guys are running 18's so lets see what you're comp reads when you have em on. And what is the overall size diff from stock?
 

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