Differential Ratio for BFG KO2 285/70/R17?

I recently got some KO2 285’s (70/R17) and I absolutely love them, only problem is the mpg tanked and as a college student that goes on the 10 Freeway East, I can’t have this problem for much longer or my wallet will run dry, what’s the best differential ratio to run with the tires so I can go back to 16-18mpg instead of 12?

 

Stock tire size.

edit: lawlz thought you asked what tire size to go back to.

 

Im getting ready to lift my truck, and im doing a bunch of research into good all terrain tires that also aren't too heavy. My truck will be mostly highway, so I know I dont need a load range e that will add a bunch of extra weight. Some of the e range ko2's can be around 60 pounds, another popular tire, the wildpeak at3 is also around 60lbs. My stock 265 TRD OR tire and rim weigh around 61 pounds. So if you buy a tire thats 60ish pounds, and a wheel thats say 25lbs or more, youre pushing an extra 100lbs, and thats not just 100lb, thats 100lbs of rotational weight. Unfortunately adding extra weight to your truck will drop your mpgs

 

http://www.grimmjeeper.com/gears.html

 

Most do 5.29 over 4.88's and then a tune. Stock automatic tacoma is 3.9 something and 4.30 for manual transmissions.

 

Soooo does that mean I should switch to 4.88? Or would 4.30 do me just fine? Also maybe I wasn’t clear enough with my question, but I have the diff ratio for stock tires and I wanted to know the exact ratio necessary to run 285’s without feeling slower or wasting more gas.

 

I understood your question. Most Tacoma owners who run 285s and choose to re-gear opt for 5.29 gears and an aftermarket tune to supplement or take full advantage of that gear ratio. The tune will help with shift parameters and overall performance. That would be my recommendation.

I can't tell you what your mpg will be with those gears and 285s, because there's too many variables (weight, driving habits, terrain, ect.)

 

5.29 is the only way to go on the automatic, regardless of tire size. 4.88 sometimes can make sense on manuals but often there the 5.29s make more sense too. Toyota really gave the trucks a crappy stock ratio on the autos with 3.909.