Tire weight differences?

For those of you with M/Ts and/or E-load tires, how much has that effected your power, MPGs, and ride on a V6? I'd like to run a 275/70/17 MT, but they're literally ~20 lbs. heavier than the stock minivan tires on my Sport.

 

I am curious about this too. How much of a weight difference would there need to be to actually get a performance change?

 

I've never calculated the difference in MPGs as you would have to use and test both type of tires for a period of time to get an accurate comparison. However, I do know that I can feel an acceleration and braking difference with tires only having a 3-4 lbs difference.

 

If you are worried about a 1-3mpg loss, stay with the mini van tire.

 

Varies, with my 69lb 35s, 35lb wheels and stock gears I can either get 10mpg floored everywhere, or 18-19 cruising the speed limit on the highway. Its obviously slower, but still can pass people just fine, still goes 100+, and after driving a stock truck the other day it isnt an insane difference. When my truck was more stock/less armor, I pulled 20mpg with 35s and stock gears from Washington to Utah.

 

I am running 215/85/r16 e rated Firetstone Destination XT's because the 245/75/R16's BFG KO's on steel wheels my truck came with reduced my mileage 10-14%, they were noisy, acceleration was horrible, and I felt it was hard on components. There was an18lb weight difference per wheel between those and my new Firestones on alloy rims. People say that a pound of unsprung weight equals about 2-5 pounds of sprung weight, so at 18lbs heavier, that's at best 144lbs, at worst 360 lbs. I'm going to say it felt like the latter.
Best scenario? Run 2 sets of rims.
I have some P rated 245/75Rr16 "minivan tires" on rims, and the Firestones on another set for road trips that will see offroad segments, and winter, as the Firestones are snowflake rated and very good in the snow (obviously not as good as X-ice, etc.)
2 sets of tires last twice as long as 1 set, and therefore, the only additional cost is the second set of rims. I picked some up for $100.
It's nice having quiet tires, and tires that I know will work well in winter.
Note that I have the 4 cylinder, but regardless of vehicle, heavy wheels/tires are not great unless you need the extra protection or are concerned with looking all macho.

 

Lost around 4 mpg when I went from stock 265/70R17 to Mickey Thompson ATZP3 LT265/75R16 then lost another 1-2 mpg when I went to Cooper Discoverer ATPII's in LT285/75R16. The Mickeys are a hybrid tire with 3 ply and the ATPII's are a AT tire with 2 ply. the weight between the Mickey and Cooper are almost the same weight just different overall dimensions.

 

No shit, but I'm not worried about 1-2 MPG. More about power loss than anything. Going from a 35 lb. tire to a 58 lb. tire is quite a jump.
But I went ahead and pulled the trigger on 275/70/17 Yokohama MTs on SCS Gen5s - going on next week.

 

At close to $8.50 a gallon, I would prefer to not lose many mpg. That and it also decreases range per tank.