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  #1  
Old 05-11-2013, 07:38 PM
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Default Leveled, new rims, new tires... now horrible gas mileage

I just leveled my truck, got new rims (17x9 steelies), and added new tires (315/70R17) and now my computer is saying I'm getting about 8.8-9.2 MPG in town. I'm not driving it like an idiot, so I know it's not my foot. I know the rims and tires are heavier than my stock 20" rims/33" tires combo, but would that make THIS much of a difference? I was getting about 14 MPG in town. On the highway, my MPG goes up to about 12. I have the 3.92 gears.

Any ideas?

When will the new tuners be available for the 2013 models? I for some reason thought I remember them not being out quite yet...
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Old 05-11-2013, 08:38 PM
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Have you calibrated your speedometer to compensate for the changes?
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Old 05-11-2013, 08:44 PM
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Is that something the dealer can do?
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Old 05-11-2013, 08:55 PM
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No idea whether the dealership can calibrate the speedomter.

Hypertech makes a plug-n-play tuner that ONLY calibrates the speedometer to compensate for tire/wheel changes. I purchased one after my shoe modifications and it works like a charm.
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Old 05-11-2013, 08:55 PM
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The dealer can re-calibrate for the new tires. Unfortunately they may charge a fee.
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Old 05-11-2013, 09:06 PM
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I vaguely remember reading on these boards a member saying the dealership can calibrate up to only a certain tire/wheel size.

Don't know.....
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Old 05-11-2013, 09:08 PM
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I didn't go too much different... I think I went from a 33.1" to a 34.7" tire.
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Old 05-12-2013, 03:05 AM
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It still makes quite a difference. You're probably out around 4 or 5%. I'd definitely either buy the hypertech or bring it to the dealer.
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Old 05-12-2013, 10:05 AM
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Hey everyone why would correcting is speedometer help his mileage?
(I am also thinking about leveling and getting bigger tires)
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Old 05-12-2013, 10:26 AM
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It won't make his mileage better. Just more accurate. The bottom line is, when you put large off-road tires on your mileage is going to suffer. If you want a Prius don't buy a Hemi.
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