1. #1

    How many miles per tank

    When y'all fill up, how many miles do you get per tank?

    My son took the 03 wrangler and drove to his first duty assignment in Colorado. He said he got 150-180 miles per tank, every tank.

    That is horrible compared to the YJs the wife and I previously owned and compared to the jk four door we also previously owned.

    The 03 got fresh trans fluid and oil the week before he left and all tires were air up properly. They are 32s and the gear was changed for the speedo/do to read properly. And it reads a exactly what my gps read so it's verified good.

    He did drive normal highway speeds. Said he didn't like how the jeep felt at 80mph so he stayed at posted speeds the whole trip which was anywhere from 65-75.

    His jeep had a pretty decent sized tank, I think 19 when I filled it up.

    So he is getting pretty bad mileage. He has that 42rle trans so he has an extra gear, right? I would have expect a hair better than our YJs got, which the wife's stock 93 Sahara got 18 regularly and my stroked with a four barrel 87 got 13.

    What do y'all get? He drove from south texas on the beach to Colorado springs so he got a few tanks in
    99 xj with 350k miles on it. Still runs great

  2. #2
    Join Date
    Feb 2009
    Location
    Dayton Ohio Area
    Posts
    6,136

    How many miles per tank

    So what tire size, gear ratios, transmission?
    The overdrive or the 42RLE is 0.69:1 which is really high and larger tires can lug the engine at 55-65mph. Lugging is harmful and running in very inefficient zone of the engine.

    Then what speed and rpm does he cruse at?

    In my 05 unlimited 3.73 rears and 33x9.5r15 with the 6 speed nsg 370 would get 18 mpg up to 20 if i hypremiled. Big thing is keeping it at 65 mph. Or between 60-65. Currently around town to work and home 290 mi/tank or app 15 mpg. That is more stop than go. App 9 lights and no faster than 35 mph. Engine hits temp in 1.5 miles or so.
    Correct tire pressure and low to no ethanol gas. Properly aligned and balanced wheels.
    Any added drag on the brick like offroad lights hood items, or bad pinion angles bad u joints or dragging brakes take away from mpg fast. Even things that inhibit natural cooling causing the fan to engage adds drag to the engine. Excessive power drain causes the alternator to run more and AC improperly charged or oiled is the same.


    Also calculate mpg over a full tank dividing miles by gallons to refill from empty.


    For reference on loading lugging the engine. Note you want to be at or slightly above 2500rpm
    How many miles per tank-image1631478175.411485.jpg

    Never look down on anyone unless you are helping them up - Jesse Jackson
    Last edited by JPNinPA; 09-12-2021 at 04:32 PM.
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  3. #3

    Re: How many miles per tank

    We will never know. He didn't keep fill up numbers. He can only give me rough numbers.

    15ish gallons at each fill up and 150-180 miles per tank.

    He has 32s with 3.73 gears. Said he drove 70-75 and had to turn off overdrive because of low rpms versus hills/mountains
    99 xj with 350k miles on it. Still runs great

  4. #4
    Join Date
    Feb 2009
    Location
    Dayton Ohio Area
    Posts
    6,136

    How many miles per tank

    Yeah he would have to be going 83 mph in overdrive to be at 2250rpm. The bottom of efficiency. But you will not have the hp to pass. A breeze can slow you down. Actually dont think the engine could get there unless down hill.

    In third 2750 rpm to go 70mph. And 2950 to go 75 mph.

    At 2550 rpm he should be at 65 mph in third. That would give the best mpg performance and keep from lugging the engine.

    Then only use overdrive when on the flat or downhill when coasting to maintain speed.

    This is all given the tires are really 32. As you know anything above 31 in diameter is called 32


    Fyi wider and more aggressive tires drag more .

    Never look down on anyone unless you are helping them up - Jesse Jackson
    Last edited by JPNinPA; 09-13-2021 at 08:01 AM.
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  5. #5

    Re: How many miles per tank

    I have an 03 TJ, manual, 3.73 and 31 inch tires. I usually get about 180 - 200 miles per tank before I fill up and get 13 to 14 mpg for city only driving.

    Has he had his spedo checked for accuracy since he got the bigger tires?

  6. #6
    Join Date
    Dec 2010
    Location
    California
    Posts
    506

    Re: How many miles per tank

    My '02 TJ gets 13 mpg on and off road, it would probably get that falling off a cliff while the engine is off.

    '02 TJ Wrangler, Automatic, 4.11 gears, 33" tires on 15" rims, regular fuel, all calibrated. Generally I run no more than 65 mph on the freeway.

  7. #7

    Re: How many miles per tank

    yes, i checked his speedo using gps and following in my truck and his is dead on after we changed his speedo gear. his tires came out to 32.1 on the tire calculator using the metric numbers off the sidewall i don't remember the numbers though.

    the tires are indeed wide and heavy but he loves that jeep now and has already sent pics of following trails around colorado springs. it sure is nice looking there
    99 xj with 350k miles on it. Still runs great

  8. #8
    Join Date
    Feb 2009
    Location
    Dayton Ohio Area
    Posts
    6,136

    Re: How many miles per tank

    What engine? I assumed I6 4.0 but I4s were an option.

    You noted a 19 gal tank.
    Mine is 19 but reads E when there is 2-3 gal left. Fill at E is 17-17.5 gal.
    Run dry ~19.5 gal


    Never look down on anyone unless you are helping them up - Jesse Jackson
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  9. #9

    Re: How many miles per tank

    I am pretty sure we will never know now. At least until he drives it back on leave sometime. He is 4x4ing all around Colorado springs after work now so gas mileage is not going to matter anyways, ha ha ha.


    It is a 4.0
    99 xj with 350k miles on it. Still runs great

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