MPG down with new rims and tires

[Hogs150]

I recently put on 20" sport rims with 275/60s and falken wildpeak AT's and i'm down close to 2 mpg I had stock 17"s with 265/70's . But i still love the new look. is it the 20's or the aggressive tread

 

[ilovemyramlaremie]

Both

 

[Rado]

I would say the added weight . I assume the new tires are 10 ply and the stock are 4 ply. BIG weight difference . And not sure how muck wider the new tires are ! Wheels may also be heavier
My buddy went from a 10 ply AT to a 4 or 6 ply (I think) less aggressive tread and gained about 2 mpg ! Also another thing is you and I are starting to get winter blended gas and that will kill MPG as well
Just ramblings from a old fart

 

[MarshRam]

Did you recalibrate the EVIC for the larger wheel?

 

[PoMansRam]

Those 17" tires were a lower rolling resistance street tire. You will lose fuel economy with the cool looking truck tires.

 

[Burla]

It can be the winter gas change that just happened, how long ago did you put the wheels on? Now that winter is coming, you can always go up in tire pressure to the upper end of the recommended for that tire, that will help.

About the switch, and yes winter gas lowers mileage across the board.

This typically occurs starting in April, allowing gas stations to start selling the summer blend by May or June. They can then switch back in September

 

[grizzstang]

Did you recalibrate the EVIC for the larger wheel?

This. If you didn't your speedometer will be out and your shift points will be off.

You will not be getting a clear picture of what your gas mileage really is.

I updated my tire size with an AEV Procal and checked it while driving with a speedometer app on my phone. It is bang on.

Ultimately the bigger and heavier you go the more the fuel mileage will suffer.

 

[turkeybird56]

Just IMHO< but between the tires and the fuel, yup gonna go down. Just how it is. Luckily that blended stuff not happen here, LOL

 

[huntergreen]

Did you recalibrate the EVIC for the larger wheel?

Unless he went up total diameter, wheel and tire, there shouldn't be a need to recalibrate.

 

[huntergreen]

I recently put on 20" sport rims with 275/60s and falken wildpeak AT's and i'm down close to 2 mpg I had stock 17"s with 265/70's . But i still love the new look. is it the 20's or the aggressive tread

Without considering the winter gas formula, the tires would lower the mpg. It's the agressive tread and the weight.

 

[Jrod]

I went from 20" factory tires to 20" Falken AT3's. Both were the same size 275/60R20 4 ply tires. My MPG's did not change, although the AT3's are 6LBS heavier on each corner.

You can find AT3 specs here: http://www.falkentire.com/tires/light-truck-suv-cuv-tires/wildpeaka/t3w-tire

 

[MarshRam]

Unless he went up total diameter, wheel and tire, there shouldn't be a need to recalibrate.

I believe his diameter changed by about an inch and a half. I could be wrong.

 

[crackerjack1957]

^^^^
MarshRam is correct you went from a 31.5" diameter to a 32.99" dia.
So your speedometer is off which will give you incorrect gas mileage from evic unless you hand calculated.

 

[Hogs150]

My speedo is off 1 mph so not sure i need to recalibrate it.

 

[crackerjack1957]

Should be closer to 3mph.......unless ya going 30mph or less
http://www.onlineconversion.com/bigger_tires.htm

Another 1 that shows tire size difference.....hover over speed graph chart to see difference
https://www.ajdesigner.com/fl_tire/tire.php

HP needed for weight & et in the 1/4 mile
https://www.ajdesigner.com/fl_horsepower_elapsed_time/horsepower_elapsed_time.php

 

[Marine Les]

There is a 4.4% difference in tire size and that alone could account for 1 mpg. Recalibrating might do more than just correcting the speedo/odo as shift points and fuel delivery might change. Also when tires are new they get their worst mpg and it goes up as the tread goes down.