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Old 05-30-2012, 09:34 AM   #1
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Loss of MPG with lift and 33" tires?

I just wanted to see if anybody is running 33" tires and see if there was a huge MPG loss in the process. Thanks!

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Old 05-30-2012, 09:41 AM   #2
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I am and I lost about 1 mpg. With the taller than stock tires they are wider and more tire is hitting the road surface, more drag. I was hoping when I changed to 33's that I would not lose MPG but silly me, I did.

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Old 05-30-2012, 09:45 AM   #3
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Stay light

1-2 w/ 35x15's

Should not see much chance w/ 33's
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Old 05-30-2012, 09:47 AM   #4
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still hovering around 14 mpg
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Old 05-30-2012, 09:50 AM   #5
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Stay away from any tire made by nitto or faulkin rocky peak for 33s or larger if your concerned with mileage.
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Old 05-30-2012, 09:53 AM   #6
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Stay away from any tire made by nitto or faulkin rocky peak for 33s or larger if your concerned with mileage.

The issue, at least in my case, is the weight of the tire, due to the thickness (many ply vs 2 or 3 ply).

I've got 33" Nitto Trail Grapplers. They robbed me of lots of power, mpg's etc. Add on my bumpers, winch and the other crap - and she's performing as expected: perfect offroad, not so nice on-road
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Old 05-30-2012, 09:55 AM   #7
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After the TF leveling kit and 33" Duratracs, I lost about 1 mpg on the highway. I don't pay attention to what my mpg is when just driving around town; that number will always suck.
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Old 05-30-2012, 09:58 AM   #8
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I lost 1 MPG (from 18.5 to 17.5) on my 2012 Sahara (4dr). I have 33" Nitto Terra Grapplers. This is likely due to increase in weight (and likely rolling resistance) of the new tires, as well as wheels.
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Old 05-30-2012, 10:01 AM   #9
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I am and I lost about 1 mpg. With the taller than stock tires they are wider and more tire is hitting the road surface, more drag. I was hoping when I changed to 33's that I would not lose MPG but silly me, I did.
You also have to consider that a stock tire makes a couple hundred more revolutions per mile than a 33. Your computer is not set to the larger size so you probably didn't lose even a mile.
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Old 05-30-2012, 10:45 AM   #10
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You also have to consider that a stock tire makes a couple hundred more revolutions per mile than a 33. Your computer is not set to the larger size so you probably didn't lose even a mile.
I never go by that computer. It is off by about .9-1.5 mpg. I always reset one of my trip odometers and devide mileage by the amount of gallons it takes to re-fill.
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Old 05-30-2012, 10:57 AM   #11
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Quote:
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I never go by that computer. It is off by about .9-1.5 mpg. I always reset one of my trip odometers and devide mileage by the amount of gallons it takes to re-fill.
I think he's sayin you need to reset your speedo. Your odometer will not read the same with different size tires
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Old 05-30-2012, 11:02 AM   #12
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Lost 2 mpg with lift and 33's. Lost another 1 mpg with new front heavy bumper with winch. Got 1 mpg back with Superchips
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Old 05-30-2012, 11:05 AM   #13
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3.21 gears and manual tranny

Stock jeep with 29s = 20.4 mpg
Stock jeep with 32s = 19.8 mpg
3/4 lift with 32" Nittos = 16.4mpg
3/4 lift with 33x12.5R15 duratracs = 19.1 mpg
2.5 lift with 33x12.R15 KM2s = 17.5 mpg
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Old 05-30-2012, 11:06 AM   #14
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If you don't change your tire size in the computer using something like ProCal or Superchips the odometer will be incorrect. Even hand calculations will be off because the odometer will show you going further with bigger tires if the computer wasn't changed to compensate. If will make it look like your getting better mileage then you actually are.
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Old 05-30-2012, 11:06 AM   #15
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I think he's sayin you need to reset your speedo. Your odometer will not read the same with different size tires
I'm not really worried about the speedo being off, it is only off by a little. I thought if I got a hold of someone with one of the modules to reset the whole system to the new tire size I would do it but...
I have changed tire size on my wrangler and had no real issues. I drive like an old man. I got it way too much trouble as a youngster driving like an idiot. I am usually right at the speed limit watching everybody pass me by.
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Old 05-30-2012, 11:11 AM   #16
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Quote:
Originally Posted by Jervboy
I'm not really worried about the speedo being off, it is only off by a little. I thought if I got a hold of someone with one of the modules to reset the whole system to the new tire size I would do it but...
I have changed tire size on my wrangler and had no real issues. I drive like an old man. I got it way too much trouble as a youngster driving like an idiot. I am usually right at the speed limit watching everybody pass me by.
The next owner will mind
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Old 05-30-2012, 12:11 PM   #17
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They are gonna bury me in this bad boy!
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Old 05-30-2012, 12:38 PM   #18
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I'm not really worried about the speedo being off, it is only off by a little. I thought if I got a hold of someone with one of the modules to reset the whole system to the new tire size I would do it but...
I have changed tire size on my wrangler and had no real issues. I drive like an old man. I got it way too much trouble as a youngster driving like an idiot. I am usually right at the speed limit watching everybody pass me by.
I drive the same way. Rarely I do over the speed limit. Usually I drive just under the posted limit and most of the time a little slower in the right lane. I'm used to it and actually enjoy driving this way, timing my lights and getting better mpg.

I've also found that after having my jeep set for 32" tires by the dealer, I've notice my speedo and miles to be more accurate to GPS using both 32.5 and now 32.8 tires than it was with the stock 32.1.
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Old 05-30-2012, 12:42 PM   #19
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Lost 2mpg with 33 Duratracs (15's) and 2.5 TF lift. Have 3.73s and an auto.
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Old 05-30-2012, 03:32 PM   #20
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You also have to consider that a stock tire makes a couple hundred more revolutions per mile than a 33. Your computer is not set to the larger size so you probably didn't lose even a mile.
A couple hundred more?? 12 revolutions per mile difference between stock Sahara tires and 33" GY DuraTracs. These are the tires I'll be ordering, and hoping that I don't lose anything noticeable in the way of acceleration and fuel economy.

Tire Size Comparison
Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
255/70-18 7.0in 16.0in 32.1in 100.7in 629 0.0%
285/70-17 7.9in 16.4in 32.7in 102.8in 617 2.0%
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Old 05-30-2012, 03:40 PM   #21
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check your tire pressures. That will account for more loss than anything, having one a little low that is... even 2-3 pounds under your norm will cause enough drag to drop by 2-3 MPG.

Same with dragging brakes... 3-5 MPG loss from that.

If your loosing more than 1 MPG, its something other than the size of the tires. Jack it up, make sure each tire spins freely. Check your PSI, keep up on oil changes and tune-ups, etc...
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Old 05-30-2012, 04:14 PM   #22
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Lost at most 1 MPG going from 32's to 33x12.50 tire.
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Old 05-30-2012, 04:30 PM   #23
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Thanks for the input guys! BTW does anyone know the gear ratio for a stock 2007 JKU X with a 6spd?
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Old 05-30-2012, 04:32 PM   #24
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Thanks for the input guys! BTW does anyone know the gear ratio for a stock 2007 JKU X with a 6spd?
3:21 unless it came with Stock factory tow package you could have 4:10's.
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Old 05-30-2012, 07:20 PM   #25
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3:21 unless it came with Stock factory tow package you could have 4:10's.
Thats what I thought. I've been looking all around my rear axle to find a little badge or stamp on it to see what size it was but I never could. Thanks!
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Old 05-30-2012, 07:58 PM   #26
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Quote:
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Thats what I thought. I've been looking all around my rear axle to find a little badge or stamp on it to see what size it was but I never could. Thanks!
Go to the jeep site. Request a build sheet using your vin #

I think 07 was only only year a non Rubi could have 4.10's. If you do, you're one lucky fellow.

There is another way you can tell by spinning your tires and counting revs of the drive shaft. Not sure of the specifics.
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Old 05-30-2012, 08:06 PM   #27
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Thanks for the input guys! BTW does anyone know the gear ratio for a stock 2007 JKU X with a 6spd?
The 07 as mentioned was the only year you could get the 4.10 in a non rubicon so you could have 3.21, 3.73, or 4.10 at this point. If you post your tire size and what your rpm's are at 70mph in 6th gear you can look it up on the common chart floating around. Here it is. remember to look at the tire size below your listed size. Most tire compress about an inch on the road

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Old 05-30-2012, 09:14 PM   #28
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Make sure and consider the tire weight when looking at tires. The more weight the worse your MPG and performance will be.
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Old 05-30-2012, 09:38 PM   #29
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I lost 1-2 mpg from just a leveling kit.. didn't expect that one!
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Old 05-30-2012, 11:01 PM   #30
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A complete smart responce, but what did you think would happen when you raised a brick higher into the air and added more rolling mass?!?!

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