2002 ford f 150 has off road tires but it is affecting our mpgs has lift kit, wat to do to improve mpg?

5.4 v8 has 15 inch rims w big offroad tires. i dont know if by getting bigger rims and less heavier and bulky tires will help

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6 Responses to 2002 ford f 150 has off road tires but it is affecting our mpgs has lift kit, wat to do to improve mpg?

  1. fodaddy19 June 10, 2009 at 2:39 pm #

    You can regear, expect to pay around $1000-$1250 for both diffs. One has to wonder; why get a full-sized truck, lift it, fit it with big tires, if you were concerned about fuel economy?

  2. kelly_f_1999 June 10, 2009 at 2:39 pm #

    bigger wheel and tire will make your gas mileage go down… you want to unless put the size of tires its came out with will fix it… and really if your not driving in mud or offroading everyday what you need them for.. if your going for looks then you will have to pay the price of more gas

  3. Zach C June 10, 2009 at 2:39 pm #

    hes right bigger wheels make the engine work harder burning more gas

  4. Kevin M June 10, 2009 at 2:39 pm #

    It probably will not be a difference that you will be able to notice. Some tips that might help…keep the weight your are hauling down, empty your tool box if you have one, don't top off your tank (fuel is about 8 lbs. per gallon, so if you can manage to run 10 gallons less, that's 80 pounds your aren't hauling), keep your vehicle cleaned and wax (resists air friction), don't run the AC, run fuel treatments to keep your injectors clean (lucus oil has a pretty good product), keep a clean air filter, have the fuel filter changed, don't gun it, don't use 4wd, don't sit and idle (go ahead and turn off the engine if you have to), draft semi trucks on the highway, get narrower tires and rims, and finally and most important, support oil exploration in Alaska.

  5. matt p June 10, 2009 at 2:39 pm #

    You need to swap running gear/ring&pinion to a lower gear. Your larger tires actually bring the stock gear ratio higher numerically lower. Your basiclly bringing the truck out of the normal powerband if its an automatic you probably notice it downshifting more often. Thats basically because your gear ratio is so high now the truck dont pull the same causing the motor to work harder in stop and go and on hills.

    For example if you had a 3.73 gear ratio with a 31 inch tire you would be in a normal powerband.
    Now if you swap to a 33 inch tire and didn't change ring and pinion. Yes the gears in the truck dont change but the larger tires are bringing that gear ratio down to a 3.55 rear end or worse.

    If you have a 31 inch tire you should have around a 4.10-3.73 gear ratio 33s-35 you should have around a 4.56. Check fourwheelparts.com for more info.

  6. Wayne B June 10, 2009 at 2:39 pm #

    Intake, Exhaust, Programmer, Electric cooling fans in place of the clutch fan.

    I have a 03 F-150 lifted on 38's and is also supercharged and get 13 on the highway. My axles are geared to 4.56's as it was said it cost alot!

    Look at it this way. 200 for a intake, 300 for exhaust, 300 for programmer, 450 for fans for a total on about 1250. Your going to have to drive FOREVER to make up the 1 or 2 miles per gallon gain you will get from the mods to make up for the 1250 bucks you just spent on them

    Just keep your foot out of it, changed fluids and filters ofter, proper air pressure in tires.

    Hope this helps

    Wayne