Tire help

[Blaze2289]

Hey guys, I'm trying to figure out approximately how many MPG's and how much power I would lose from going with a bigger tire. My 18 Silverado 4x4 with 3.42 gears has 255/70r17’s on it and I would like to level and put 285/70r17’s on it. If I go with a tire that isn’t E rated and isn’t much heavier will it still hurt performance and MPG’s significantly?

[jaxcam02]

Obviously the larger you go the more exponential the decrease in mpgs and power will be. Also if your going from a LT or Passenger tire to an all terrain is going to make a difference.

I went from the OEM General tires 255s on the 17 inch wheel to 275s on a 20 inch aftermarket. I didn't really notice much power difference. The mpgs took a little hit but I can still get 24 mpgs on the highway if I'm not plowing through a massive head wind.

[4weight]

My AT has 33x12.5x20 Toyo AT2's on it and here is what I get.  Hwy with wind or headwind 15-17.  No wind or downwind 20 or so.  Hauling an ATV about 12-14.  City about 15-16 but don't do that much in my truck.  I have the same gearing 5.3 ltr.  That 285/70/17 is basically a 33" tire.

 

Good luck ! PS.  Love these Toyo AT's.

 

4W

[Blaze2289]

Thanks for the input guys. I’m trying to figure out the best way to go about leveling my truck out. I like the look of a leveled truck with 33’s and I know it won’t look right if I level the front without upsized tires. Been throwing around the idea of dropping the rear some.