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Old 01-09-2011, 09:30 AM
360ci 360ci is offline
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Join Date: Nov 2009
Location: Kitchener, ON
Posts: 989
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.
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Old 01-09-2011, 02:11 PM
Gravel Rat Gravel Rat is offline
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Join Date: Jul 2002
Location: British Columbia
Posts: 9,544
Originally Posted by WorldsStrongestLandscaper View Post
Well I like to DRIVE my 05 F-550 Crew 12' Rack 6.0 like its supposed to! I get 4-5 miles per gallon in town 51 Gallons= 200-225 miles!I have the lower gear ratio. I built the truck myself. WTF do u do to get more than 10????!!!!BIG STEVE B CT STRENGTH WSL
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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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