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I heard some talk on this web site about losing mpg b.c of heavy rims? Is this true? and if i go from the stock 05 civic ex 15's to some chrome 18 inch mr7's, ABOUT how much will i lose???

 
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it shouldn't affect too much........ but chrome 18's will be heavy.... you'll most likey notice the loss in acceleration more than gas milleage.

 
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you will lose mpg, but you will not even notice it

 
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EXACTLY WHAT HE SAID!!!!! ^^^^^^^^^^^^^^^^^^^

 
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chrome and 18's? Yeah, that'll drop 3 or 4 mpg under normal driving. If you're a very aggressive driver like my cousin, always hitting VTEC and quickly accelerating and stopping, then you'll go even further below that.

 
Rep Power: 385

yea you do i notice it a lot i get like 270 with city driving in town with my 17 subzeros, on the highway its maybe 30- 31 mpg , so believe me a lot more happened then just a loss of acceleration

 
Rep Power: 350

Get Real

 
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I went from stock --> about 35 mpg
17" Motegi MR7's --> about 31-32 mpg
18" Konig Prophets --> about 27-29 mpg

This is under normal driving conditions.

 
Rep Power: 335

mileage varys by A LOT than just wheels. the climate, shift points(manual), tempeture (i believe almost any car will perform better at night), traffic, highway or city, etc.

the only noticeable difference i would compare with 18s and 15's is acceleration.

 
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i have hammerheads which im assumin r kinda on the heavy side .. maybe some gt3's for spring instead?