Did a search but couldn't find what I'm looking for. I'm looking for feedback from forum members who have switched from the stock tires to BFG KO2's in the stock size. Either C or E load range will be fine. Just purchased new wheels and I'm trying to decide on what tires to buy.
MPG loss when switching to BFG KO2's
- Thread starter WTERUNNER
- Start date
Register to hide this ad
Same here. I expected more of a loss due to the weight.
Pkniland
Member
Same with me
1engineer
Moderator
Don't worry, when you add a lift, skids, rack, winch and bumpers you will lose about 5-6 mpg total.
If you are keeping stock size you will only see a few tenths of loss. Everything is additive though.
Pretty much the same for me. I don't really track mpg that closely though. The hit was negligible though, wasn't more than 1mpg lost.
manofsteele2003
New member
You will lose some off the bat going from stock to a more aggressive all terrain due to more friction. Also with the increased weight (45lbs for the C and 52lbs for the E) you will lose some MPGs, compared to the stock tire which is very soft and doesn't weigh s**t.
Jetboy
New member
It will depend on whether you get C or E. The rolling resistance is the primary culprit in tire mpg loss - the weight doesn't matter nearly as much as the heavier tread and sidewall rolling resistance. The weight is a pretty good predictor of rolling resistance though.
My guess - I don't have those specific tires - is that you'll lose 1-2mpg going to a c and 2-3 going to a E. On my last 4runner I lost about 2-3 going from a p-metric all terrain to an LT.
A lot of this should depend on where you're going. You aren't going to even approach the weight max, so the only reason to go to E rated tires is for sidewall strength. Are you tearing sidewalls? On my daily driver I just don't see that risk as being high enough to warrant the loss in mpg. On my trail rig - I run bias ply tires for extra tough sidewalls because I usually do ruin most tires by ripping sidewalls before the tread wears out. Think about what you're realistically going to do and what type of terrain you'll be in.
My guess - I don't have those specific tires - is that you'll lose 1-2mpg going to a c and 2-3 going to a E. On my last 4runner I lost about 2-3 going from a p-metric all terrain to an LT.
A lot of this should depend on where you're going. You aren't going to even approach the weight max, so the only reason to go to E rated tires is for sidewall strength. Are you tearing sidewalls? On my daily driver I just don't see that risk as being high enough to warrant the loss in mpg. On my trail rig - I run bias ply tires for extra tough sidewalls because I usually do ruin most tires by ripping sidewalls before the tread wears out. Think about what you're realistically going to do and what type of terrain you'll be in.
Last edited:
2014 Warthog
New member
Going from stock (P-265) size street radial to stock size AT I lost about 1 mpg due to the softer rubber compound and less road friendly tread pattern.
Going from Stock size P AT to 275 LT (KO2 specifically) I lost another 1 mpg (slightly less).
Going from Stock size P AT to 275 LT (KO2 specifically) I lost another 1 mpg (slightly less).
I'm going with the C load rating, don't need the E.
That's about what I had figured on. With the extra weight of the tire and more aggressive tread I expected to lose some MPG.
I'm at a total of 4.5mpg loss after adding toytec boss lift, shrockworks front bumper with winch, rear bumper, sliders, full size spare and trail rim on swing arm and a Gobi stealth. Not bad. I thought it would be more. I went from 19.1 stock with stock tires to 14.5 with short in town driving.
Yikes! That's too much of a loss for me. I was going to run a set of street tires on the new wheels and then AT's on the stock wheels and switch as needed. Then I thought exactly how much would I really lose and is it worth it to go through the expense and hassle of using two sets of wheels. I decided it's not and will just run the BFG KO2's on the new wheels.
Hbryanlopez
New member
my cpu says 14.7 right now :roadkill: stock tire size with bfg ko2, gobi rack, bilstein set at .75. used to be 15 and some change with the same setup. :crybaby:
Jetboy
New member
I've tried to make sure I keep my setup as light and fuel efficient as possible. To that end I've got wrangler ATS tires in stock size. I did a hidden winch mount to keep the original bumper. I kept my sliders weight down. And I haven't added any lift... yet. I also have stock trail edition skids. I need to get one for the transfer case/ crossover pipe. Otherwise I'm going to stick with the stock skids until I put a hole in one of them. I've done a fair bit of plowing with the front, but not enough to tear it off or put a hole in it yet. Until then - stock skids are what I'll keep.
My last highway trip I averaged 21mpg over 800 miles. I'm pretty darn happy with that performance considering I also drove about 80-85mph the entire way.
I'd really like to figure out a variable height suspension setup. My inclination is adjustable front coilovers with rear airbags. So I can bump it up for the 2 or 3 trips a year to moab where I really want more clearance and bigger tires. The rest of the time I'll leave it lower. In a perfect world I'd figure out how to build air adjustable coil buckets front and rear so I can run low on the highway and pick it up offroad without losing suspension travel and feel. But for now I'll just have to settle for stock height.
My last highway trip I averaged 21mpg over 800 miles. I'm pretty darn happy with that performance considering I also drove about 80-85mph the entire way.
I'd really like to figure out a variable height suspension setup. My inclination is adjustable front coilovers with rear airbags. So I can bump it up for the 2 or 3 trips a year to moab where I really want more clearance and bigger tires. The rest of the time I'll leave it lower. In a perfect world I'd figure out how to build air adjustable coil buckets front and rear so I can run low on the highway and pick it up offroad without losing suspension travel and feel. But for now I'll just have to settle for stock height.
jwkilgore
New member
It's all about your driving habits. Aggressive treads affect MPG for all aspects of driving, so you'll see a small loss there no mater what you do.
Heavier and/or bigger tires affect acceleration; it takes more gas to bring the extra mass up to speed, and larger diameters reduce your torque at the ground level. I accelerate easy, so I probably wouldn't see a huge difference between different weight tires. My wife comes off the line like every green light is on a drag strip. She can't stand it if the person beside her "beats" her off the line. Same with stop signs, and she keeps the same speed going up or down steep hills. With stock tires, when I drive I get between 22-23MPG in mixed city driving. She always hovers around 16-17MPG.
I did a lot of research when deciding which tires to replace my worn-out factory tires; I really wanted to go up 1-2 sizes, but it's her daily-driver and I realized I wouldn't be able to afford her gas bill.
Heavier and/or bigger tires affect acceleration; it takes more gas to bring the extra mass up to speed, and larger diameters reduce your torque at the ground level. I accelerate easy, so I probably wouldn't see a huge difference between different weight tires. My wife comes off the line like every green light is on a drag strip. She can't stand it if the person beside her "beats" her off the line. Same with stop signs, and she keeps the same speed going up or down steep hills. With stock tires, when I drive I get between 22-23MPG in mixed city driving. She always hovers around 16-17MPG.
I did a lot of research when deciding which tires to replace my worn-out factory tires; I really wanted to go up 1-2 sizes, but it's her daily-driver and I realized I wouldn't be able to afford her gas bill.
