275 or 285 yes its dead beat horse but

yes i know its dead beat horse topic but i didnt find any good data on MPG and tires, i am at point where i can go ether one size but dont want to go lower then 15mpg, i have 265/70/17 ko2 and lifted with icon stage 3, and put about 40k on those tires so before heading out to next adventure thinking going up to 275 or 285 but curiuos if MPG is really bad.

 

Yes. Bad. 15ish

Do you daily your truck? If not, 285 all day

 

I do daily it sadly on it.

 

I’ve read through the threads too but honestly it’s impossible to factor in DCLB, SB, Reg Cab, AC cab, 2.7L/3.5L, armor no armor, hills, flat upwind, etc... if you’re increasing tire size expect to take the hit. I haven’t gotten past 17mpg and my truck is 3 months old with 5500 miles. Granted half my daily driving is dropping and picking up the boy from school through stop sign ridden streets.

I can probably squeeze 18-19 mpg on long stretches of hwy but I’m content with 16-17 per tank.. it’s only gonna get worse once I get bumpers, tonneau, and full skids.

 

255/80-17! Pizza Cutters FTW!

 

If it is that big of a deal to you I would stay where you are, or get a second set of large tires/wheels and switch them out to play.

 

Driving habits are your greatest enemy. Next is big 'ol tars and heavy wheels. Then weight. Read the links below in my signature.

 

thats actually not bad idea

 

Dude, neither of those are good for mpg. The wider the tire the worse the mpg due to friction and weight. Go 255width, something like 255/75/17 (32") for better mpg

 

215/85 R16, now that's a pizza cutter! Way better for acceleration and mileage. Not so great for sand. Wonderful for rain and snow.

 

how is it offloading with these? sand/mud/snow? rocks?

 

I have 275/70/17 ko2s load range E. I get 17-18 MPG. I’m thinking about going 285/70/17 ko2s load range c which are 4lb lighter (per tire) than the 275s I have right now. I think it will help to keep my mpgs

 

Wider is better for mud and maybe sand...like sand dune sand. Skinnier is better for ice, snow, street, and trails. directional control is better with skinnier tires unless you run BIG weight

 

I'm running 275/70/17 ST Maxx and average right around 14.5mpg

Even with the stock tire size, I would never get better than 17mpg average. It depends on so much more than just tire size. Weight, tread pattern, PSI, how hard you push the gas, the environment you live in. SO MANY THINGS.

One thing you should know is if you're going with E load tires, it's going to be very stiff. You'll most likely need to run less than 30psi for it to be somewhat comfortable, though that means more rolling resistance, and therefore lower MPG's too.

 

DeWalt impact and a good floor jack and you can switch them out in less than 10 mins. Just have to deal with the TPMS alarm for the weekend but it would be worth it.

 

Anyone have input is if i should go E or C rating on them? i did notice they have that available.

 

true i currently have 265/70/17 KO2 and if psi is above 35 mpg goes to 17.9 but ride is harsh, if i go 32 psi the mpg goes to 16.6, one thing thouhg i will say the E rating saved my ass few times on trails where i suspect C rated tire would of been torn these things are tank.

 

C all the way. E is overkill.

 

I would say C for sure. I will be going to C load after these E load Coopers wear out. Phenomenal tire, but rock hard.

 

I have 285/70/17 and I went from about 19-20 average MPG on a tank to 15-16 MPG a tank, that's with city driving and I feather the throttle most of the time. It kinda depends on the stop and go traffic, some days when I only stop once, I get 19 MPG on a trip to work which is like 3 miles away lol