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35 inch tires and MPGs

Chev2021
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Chev2021 New Member

Chev2021

Posted
Posted

I lifted my 2021 silverado RST on 35x12.50x20s with a 6 inch lift and my MPGs went to s**t... I expected a little bit of a decrease but I've seen it go down to average 9-10, when before I was getting 14-15 regularly. Now, I can only average 15 with cruise control down the highway for half an hour.

 

I've looked around seeing people saying to calibrate the computer for the new tires? Would a dealership do that or an outside company?

Also regearing was an option too for better MPGs? I just dont want to spend 80 bucks on gas every 5 days haha.

blckblt Enthusiast

blckblt

Posted
Posted

Did you get recalibrate you speedometer?  If not you will need to hand calculate and get the miles driven by GPS/app as your computer will be off.

Tx_Bowtie Enthusiast

Tx_Bowtie

Posted
Posted

I average 15-16 mpg combined with 35x11.5 per the computer.  Would read slightly more if calibrated.

 

Flatblack83 Enthusiast

Flatblack83

Posted
Posted

Mine read in the 12s at 1st with bfg km3s 35-12.50-20. After calibration and 2 tanks of gas its in the 15s.  The pulsar worked good for me, 15s isn't great but sounds better than 12..haaaahaaa...

eppieguy Senior Enthusiast

eppieguy

Posted
Posted

I'm averaging 15.5ish with 34.4" tires, but I did buy the Hypertech speedometer calibrator . 

J2Jones Enthusiast

J2Jones

Posted
Posted

 

You definitely lose MPG when going larger.   In my case, I moved to 35x11.5 NRG's.  I used the WAZE app to determine that at an indicated speed of 63, I'm actually going 65.  About a 3% difference.  To me, that means my MPG and distance traveled are understated by about 3%.  I have mixed highway, rural city driving and average about 17.5 MPG.  To that's about 18 MPG corrected versus the 19.5 MPG I used to average before upsizing the tires.  Seems to me I lost about 7.7% in MPG related to the change but maybe I've missed something. Idk.

GullLakeMi Enthusiast

GullLakeMi

Posted
Posted

Have you calculated manually at the pump?  The computer on my '16 Sierra already showed 1 or 2 MPG better than reality.  Maybe yours is reading the other way?

blckblt Enthusiast

blckblt

Posted
Posted

Unless you recalibrate the speedometer the computer will not read MPH right and mileage driven will be wrong.  With those being wrong MPG numbers from the DIC will be wrong.  You must 100% hand calculate with miles driven by GPS or an APP (waze etc) and then use gallons off the pump.

JAEDEE Enthusiast

JAEDEE

Posted
Posted

I'm running 35x12.5 Toyo RTs and average 16 MPG.  I do have the max trailering package with slightly lower gearing (3.42 vs 3.23) though.

TyGriff13 Enthusiast

TyGriff13

Posted
Posted

I'm running 35" Nitto Terra Grapplers and my gas mileage is laughable, but hey I did it to myself. Truck sure looks good! Lol. Long story short, I'm averaging 12.3 MPG and I can get around 15 MPG if I'm cruising on the highway. 

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