ok, i recently switched from 265R70x16's to a little bit wider 265R75x16, since then my fuel economy has gone down from around 320 miles from about 22 gallons down to about 290 miles from about 22 gallons. aparently because there is more tire surface on the ground, more friction and therefor less fuel economy and my truck is sluggish now. i will say this much, theyre goodyear trackers that i got at wal-mart for $75 and after all that rain in california, i did not hydroplane once. and i dont drive slow, i was going 95 on the 91 in the rain all the way from the 405 to the 57, and i didnt hydroplane once. they do have exellent traction but i dont know if it weighs out for the sluggish feeling and poor fuel economy, im getting fuel economy like i own a ford. oh well, just thought id tell you guys incase you didnt already know, DONT GET WIDER TIRES.
ok, i recently switched from 265R70x16's to a little bit wider 265R75x16, since then my fuel economy has gone down from around 320 miles from about 22 gallons down to about 290 miles from about 22 gallons. aparently because there is more tire surface on the ground, more friction and therefor less fuel economy and my truck is sluggish now. i will say this much, theyre goodyear trackers that i got at wal-mart for $75 and after all that rain in california, i did not hydroplane once. and i dont drive slow, i was going 95 on the 91 in the rain all the way from the 405 to the 57, and i didnt hydroplane once. they do have exellent traction but i dont know if it weighs out for the sluggish feeling and poor fuel economy, im getting fuel economy like i own a ford. oh well, just thought id tell you guys incase you didnt already know, DONT GET WIDER TIRES.
Actually you didn't go wider, you went with a taller tire. So you are getting less rotation....
Yeah and really you didn't go up that much....
You're getting about the same fuel economy I get with my 32"s
I drive like a bat out of hell and then try to recoupe my fuel economy...but I get around 13mpg.
I'd say your driving habits are to blame.
Also...you can regear to make up for loss fuel economy but friction with bigger tires will hinder economy a bit in the end.
By going with the taller tires, your mileage will go down a bit, but not much. Bigger tires require more power to get them spinning. The main reason for such a change in your milage is because your odometer is now off. Because of the bigger tires, you are actually traveling farther than your odo reads.
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'01 Color-Keyed Limited Tundra TRD 4x4
JBA Headers, TRD Exhaust, IS Grill, IS Bilsteins, Hellwig Sway Bar, AR-23 wheels w/ 265/75 Yokohama AT's, SnugTop XV Shell, BedRug, Yakima Rack
Don't forget to account for the fact that your odometer is now reading ~3.5% less miles due to your taller tire. So you actually drove 300 miles in that tank, not 290.
__________________ TRUCK: 2001 2WD V8 AC MODS: JBA headers! Magnaflow muffler, TRD 4x4 coils & shocks, Wheeler's AAL's, Truxedo bed cover, Bridgestone Dueler AT LT265/75/16, Surepull hitch, Drawtite convertor box, MAPP nerf bars, Toyota bed mat
what they said, also keep an eye on your skinny pedal usage. my mileage really hasnt changed much despite having run 33" knobbies for the last two years instead of the (effectively bald) all-seasons provided by the dealership.
Actually you didn't go wider, you went with a taller tire. So you are getting less rotation....
265 = width
75= height
You might want to try adding a few psi to your tires to help get that rolling resistance down a little.
Running the 285/75R16 puts a lot more footprint to the ground that the 265, but the only difference I notice is a little less torque off the line. My mileage has gone up with the larger tires provided I keep them aired above 35 psi for normal driving...my rpms have dropped at 50 mph from 1700-ish to 1350...you get the point....
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2004 Pontiac GTO
2005 Dodge Magnum Special Edition SXT
1991 Honda Nighthawk 750
1987 4Runner
So with me going to a 275/70/16 from stock 265/70's, how much difference would this make in gas mileage. Many people actually state that after going to 275/70 the speedometer would be dead on. But, by moving up a little in height and width, I am sure my gas mileage is being affected slightly. What do you guys think?
So with me going to a 275/70/16 from stock 265/70's, how much difference would this make in gas mileage. Many people actually state that after going to 275/70 the speedometer would be dead on. But, by moving up a little in height and width, I am sure my gas mileage is being affected slightly. What do you guys think?
I just put on 315/70/17's on my truck. I tracked the miles it takes to get to work with stock -vs- larger tires.
Stock = 33.6 miles to work
and the exact same route with the larger tires,
315/70/17= 29.7 miles to work
So I'm going 1.132 miles but only registering 1 mile on the truck
or when my truck states it went 350 miles, really it went 396.2 miles. Considering I used to get 400 miles to a tank, know to stay even with that, I just have to register 350 miles..
Wider tires usually do reduce mileage due to increased fricton due to wider footprint. As far as the tire height goes I think it all depends on the vehicle in question, how much power it has and how it is geared. I have found with vehicles that had marginal power the fuel mileage decreased dramaticaly when going to a taller tire because it actually gears your car/truck higher like an overdrive causing the vehicle to work harder to sustain the same speed using more fuel. On something like the Tundra though, especially the 4.7 VVti this might not be an issue and may increase the mileage providing you don't go too large to the point where it is sucking a lot of power to turn the larger tires. I'm thinking about going to the 265 75 16's for my 05 4x4, they would only be about an inch and a quarter larger in diamater so hopfully I won't lose mileage. I am told that the only way to get around this with large tires is to change the final gear ratios in the diffs to compensate for the large tires.
Triggs, what formula did you use to determine fuel economy?
I've been using the old divide miles traveled by how many gallons I put in.
No real formula. I new I was going to get bigger tires for the last 4 months. So I'v basically been averaging out how many miles per tank, and getting exact miles to different places with the stock tires. Such as going to work from my garage and to my brothers house. So when I did put on the larger tires and get the exact miles with those on, then I compared the differences.
In both cases it equaled out to right at 1.132 and 1.1313 miles to my now 1 mile. I just divided the miles of then and now as in my other post as 33.6 before to 29.7 miles with the larger tires. I go the exact same way to work and set the odometer right at 0.0 in my garage, so I would asume its pretty acurate.
Then since I'm 1.132 miles to my 1 mile, I just did 350 x 1.132 =396.2
I am actually going to fill up for the first time tomorrow to see about how many miles I can get now on a tank. I'm hoping it's between 340 - 355 miles, then this way I would know I didn't loose that much avg miles per gallon.
wider tires, less fuel economy?
, and he is always gettin compliments from ladies at school on his truck.
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