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-   -   Leveled, new rims, new tires... now horrible gas mileage (

Thet 05-11-2013 06:38 PM

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...

Grubrunner 05-11-2013 07:38 PM

Have you calibrated your speedometer to compensate for the changes?

Thet 05-11-2013 07:44 PM

Is that something the dealer can do?

Grubrunner 05-11-2013 07:55 PM

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.

Bruce E 05-11-2013 07:55 PM

The dealer can re-calibrate for the new tires. Unfortunately they may charge a fee.

Grubrunner 05-11-2013 08:06 PM

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.....

Thet 05-11-2013 08:08 PM

I didn't go too much different... I think I went from a 33.1" to a 34.7" tire.

brandonjansen 05-12-2013 02:05 AM

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.

ADA16 05-12-2013 09:05 AM

Hey everyone why would correcting is speedometer help his mileage?
(I am also thinking about leveling and getting bigger tires)

h2oman 05-12-2013 09:26 AM

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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