AmericanThunder Report post Posted April 6, 2015 Last week I had some leveling shocks and 33" tires put on my truck. Going into it I knew I would loose a little in the MPG department, but so far I am down about 3.5 MPG after the upgrade. I may be naive, but that seems like a lot for just a leveling kit and 1.5" bigger tires. I know I'm not the only one to have done this, so what are your guys experiences? Is that what I should expect? Share this post Link to post Share on other sites
JLW Report post Posted April 6, 2015 Last week I had some leveling shocks and 33" tires put on my truck. Going into it I knew I would loose a little in the MPG department, but so far I am down about 3.5 MPG after the upgrade. I may be naive, but that seems like a lot for just a leveling kit and 1.5" bigger tires. I know I'm not the only one to have done this, so what are your guys experiences? Is that what I should expect? did they correct your odometer? James 1 Share this post Link to post Share on other sites
longshooter Report post Posted April 6, 2015 I put a leveling kit on my 2014 Silverado crewcab 1500 4x4 with the 5.3 and put 33" toyo mudder's on it. I'm down 1.5 to 2.0 mpg. But I also drive pretty aggressively. 1 Share this post Link to post Share on other sites
208muley Report post Posted April 6, 2015 Sounds close. I went from stock to level kit and 33s and lost about 2-2 1/2 mpg. Then I went to a 6" lift with 35s. Two things I will say..... Truck looks great and loves all gas stations! I have to take out a 2nd mortgage if I tow the rv. This is on a tundra. You gotta pay to play I guess. 2 Share this post Link to post Share on other sites
208muley Report post Posted April 6, 2015 Don't trust the truck computer. Do the real math to get your real mph. Fill up, zero the odometer, fill up again then do the math. It might not be as bad as the computer says it is... Mine was wrong. 2 Share this post Link to post Share on other sites
AmericanThunder Report post Posted April 6, 2015 Don't trust the truck computer. Do the real math to get your real mph. Fill up, zero the odometer, fill up again then do the math. It might not be as bad as the computer says it is... Mine was wrong. I am almost through a full tank since the install, so I will verify the actual milage, but so far it is spot on. Last week I had some leveling shocks and 33" tires put on my truck. Going into it I knew I would loose a little in the MPG department, but so far I am down about 3.5 MPG after the upgrade. I may be naive, but that seems like a lot for just a leveling kit and 1.5" bigger tires. I know I'm not the only one to have done this, so what are your guys experiences? Is that what I should expect? did they correct your odometer? James Good question. I can only assume so, but can't imagine them not doing it. Never know though. Share this post Link to post Share on other sites
Hunterjohnny Report post Posted April 6, 2015 Use your GPS to verify speed and miles, but when I went up a size I lost about 2 mpg. 2 Share this post Link to post Share on other sites
Str8Shot Report post Posted April 6, 2015 ^^^^^^^ What he said^^^^^^^^ and get your speedo gear as the police these days do not seem as nice about using the excuse I just lifted my truck and put on bigger tires .... 1 Share this post Link to post Share on other sites
PRDATR Report post Posted April 6, 2015 Go on Tirerack.com and look up the stock tires and the new one and see what the rotations per mile are. 1 Share this post Link to post Share on other sites
Arizona Griz Report post Posted April 6, 2015 Use your GPS to verify speed and miles, but when I went up a size I lost about 2 mpg. While the GPS will register the miles per hour more accurately than the truck it does not take into account differences in elevation so the total miles will be less. 1 Share this post Link to post Share on other sites
lancetkenyon Report post Posted April 7, 2015 Doing actual math, not relying on odometer and what the fuel average computer says, I get right at 14.8mpg with a 6" lift and 37s on a 2007 6.0 Powerstroke. I never adjusted my odometer or speedometer, and I am off by 18% on both. Which is right in line with the tire size upgrade. Bigger tires=more lug on the engine, engine not running at peak RPM for performance, and more fuel consumption to get rolling and maintain speed without regearing to match. 1 Share this post Link to post Share on other sites
More D Report post Posted April 7, 2015 2013 F250 6.7 stock rubber =18mpg on mixed city/freeway. aftermarket larger size tires 35-36inch no lift=15mpg. trucks computer is always off by ~10%. Fill up all the way to neck. Zero miles. drive. near empty re-fill to neck and divide by miles driven for accurate MPG. More D 2 Share this post Link to post Share on other sites
naturegirl Report post Posted April 7, 2015 As much as I wanted to be higher with bigger tires, when I upgraded I only bought the same size tires that came on the truck but off-road tires). I've noticed no difference in MPG (no leveling kit yet either). Sucks sitting stock though - so that is your alternative. My tires are very functional, but don't look as good as if they were bigger with a leveling kit but I'm still getting around 16-17 mpg in my Dodge (5.7L). 1 Share this post Link to post Share on other sites
AmericanThunder Report post Posted April 7, 2015 I filled up this morning and did the math to compare to my trucks computer and it was about the same 16.4 to 16.8. Prior to the leveling and 33" tires I was at 19.9. (2013 F150 ecoboost). Share this post Link to post Share on other sites
.270 Report post Posted April 7, 2015 if you don't correct your odometer for the different tire sizes you can't calculate mpg. your truck senses how many revolutions your tire makes but it doesn't know how big the tire is. without fixing it, you're wasting your time trying to figure the mpg. they can ususally do it by tweeking the computer. most everything is electronic these days. if you still have a cable driven speedo, you'll hafta put a different gear on it. (i am talkin' about speedometers here, not some o' your choices in swimwear) Lark. 1 Share this post Link to post Share on other sites
