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Originally Posted by sharpx
I'm thinking about puting 20 inch wheels on my impala ls. How does this affect gas milage? Also what about the ride comfort? Will it mess with the speedometer and/or make me get it speed calibrated?
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damn. so basically it doesn't seem like something I can do. I'm selling my Mustang GT to get an impala. Reason being my mustang is bumpy and uncomfortable. I have H&R super sport lowering springs on it and it causes the ride to be rough as hell. I don't want a repeat with the impala. Do you think the amount it effects gas milage is a lot? or just like having a fat kid ride with you? LOL.
how would you correct the speedometer? I know on my Mustang when I got 4.10 gears I had to get a speedcal, but it could never be perfect like stock and is actually off by about 10 mph depending on how fast you are going.