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Old 11-09-2009, 12:23 PM   #31 (permalink)
drew1d
EcoModding Lurker
 
Join Date: Nov 2009
Location: Pawlng
Posts: 21

Push - '03 Honda Civic Si (Ep3)
90 day: 28.27 mpg (US)
Thanks: 1
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I've changed my tire size, but kinda net'd my resulting mpg.

I bought larger wheels 17x7 compared to my 15x6. The 17's are actually a little lighter than the 15s, but the tires are heavier.

My Civic Si is geared close, so the larger diameter wheel made it longer, but since the tires are wider, I'm not sure if it made a difference as mpg's go.

I bet if I just replaced it with 15" rims that were lighter, I could have gained 1mpg.

There are so many factors, I think stuff like this falls into the "Trial and Error" sort of testing, rather than having a definitive answer before anything has changed. I'm glad to see you gave it a shot, and now we know.

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