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Old 03-31-2014, 08:20 AM
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20x10's on ecodiesel - 4 mpg decrease

Hello all-

I replaced the factory 20's with 20x10 srt replicas. Yokohama 295/45/20's. Then reprogrammed the vehicle for this tire size.

I am seeing a 4 to 5 mpg decrease. Mostly from city driving. Highway seems to be a slight decrease.

I then researched and found the the factory tire and wheel package is 19lbs lighter.

Obviously the tire is wider, stickier than an all season tire. I really didn't think it would decrease this much though.

Those who have replaced their tires and wheels- have you seen this with yours?
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Old 03-31-2014, 01:32 PM
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Re: 20x10's on ecodiesel - 4 mpg decrease

Its not sticky that gets you...its rolling resistance. More tire on the ground creates more resistance (in addition to more grip in turns). Verify your tire pressure and bump them a few psi, and I bet you get some of the mpg back. I run 40 in my fortera 20s (stock summit wheels) and have good wear, nice ride, and decent mpg considering winter blend and short commutes through the mountains to work.
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