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I need economy numbers

Discussion in 'Trucks and Trailers' started by bobcat_ron, Jan 7, 2011.

  1. 360ci

    360ci LawnSite Senior Member
    Messages: 998

    F550 weighs more than a F450. Depends also on cab config, bed options and length, etc. 4-5mpg seems low. You can get a class 8 that gets better mileage. Something doesn't sound right. My old F450 V10 with 11' service body and 4.30 gearing got 9mpg on a bad day. Thus, the smaller diesel should easily get 10+.

    Running a low geared truck on the highway is the wrong way to do it. You have to compromise otherwise an aftermarket two speed axle would be the way to go for maximum economy. If your engine runs over 2500rpm at 65-70mph highway, you're over-geared and just wasting fuel. Loaded, you should be in the 2000-2300rpm range so there's enough flexibility for you to downshift to maintain momentum (speed) on the highway.
  2. Gravel Rat

    Gravel Rat LawnSite Fanatic
    Messages: 9,544

    My truck weighs 9800lbs empty it is a 2006 F-450 2wd I get 12 mpg empty and 10 mpg with a load on the truck. I also live in a area with 10% grades the truck is never on flat land.

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