Hey everyone well I just recently put the new tires on and finished the lift the tires are 285/75/17. With the 3 inch lift. So anyway it put my mileage to no better the 11mpg. Should it make that much of a difference? It's a 08 only 65000 miles and of course all current maintenance It also has a K&N intake.
Any ideas? Thank you
Horrible gas mileage please advice needed?
Moderator: volvite
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Baedarlboo
- Posts: 49
- Joined: Fri Sep 23, 2011 4:16 am
What mileage were you getting before the tires and lift were installed? Do you have the v6 or v8? How many times have you calculated your mileage with this lift and tires? I agree that your mileage will decrease with larger tires and lift but I think it should be better than that. Heck, my 20 year old Jeep has a 4" lift and 33's get's 15-16 mpg.
Have you adjusted your calc for the speedo/odo difference from stock? That's a huge swing there in tire size....somewhere north of 10% difference. That's probably 2mpg right there if you haven't adjusted for the odo.
Between the wider more aggressive tread (assuming), higher stance, and heavier tires...I would think 13-15mpg would be pretty reasonable. Highway is where you'll see the biggest change.
Between the wider more aggressive tread (assuming), higher stance, and heavier tires...I would think 13-15mpg would be pretty reasonable. Highway is where you'll see the biggest change.
You probably don’t remember this, but 30-40 yr ago the hot rod crowd wanted mag(nesium) rims that were lighter which made the tire assembly lighter than steel rims which made the 0-60 times quicker. Wide tires were needed for the extra traction. I had some big wide tires on a used S10 and that truck couldn’t roll down a hill. Finally put some standard width passenger tires on it and got fantastic MPG.
Also those 80# PSI “truck” tires affect MPG as well. So unless carrying heavy loads, think twice. Tall tires affect the final gear ratio the mfg determined best for that engine/truck setup. With gas now predicted to get to $5 a gal this summer, divide that by 11 = 45¢ per mile ! ! ! Some tires now have a “LRR” rating which rates the rolling resistance for those who are MPG concerned. I think this $3 gas has made us lazy.
Also those 80# PSI “truck” tires affect MPG as well. So unless carrying heavy loads, think twice. Tall tires affect the final gear ratio the mfg determined best for that engine/truck setup. With gas now predicted to get to $5 a gal this summer, divide that by 11 = 45¢ per mile ! ! ! Some tires now have a “LRR” rating which rates the rolling resistance for those who are MPG concerned. I think this $3 gas has made us lazy.
One more thing to consider is that oversized tires change the final gear ratio which affects how soon the torq converter locks up or how easy it is to unlock due to the strain. There goes your MPG. Thus a smaller diameter tire is better suited for city stop-and-go driving or in the hilly parts of the country. If mostly hyway / flatland driving, a taller tire may be in order. For customer satisfaction, mfg used to tweak rear end ratios for the area of the country you lived.
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