Join Date: Mar 2012
Location: Skiatook Oklahoma
Re: 1999 F450 MPG improvements
For a 450, that's probably about the best you can get.
Gears will help, but it will take a very long time to see a breakeven point.
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1979 chevy c30 dually, sm465, 373's? Converted to 6.2 diesel, pump turned up and advanced a hair.(wrecked)
1994 ford F350 dually 4X4: 7.3 powerstroke, 5 speed. 6637, straight pipe into dual stacks. Cooper discoverer at/3's.
2010 Jetta TDI 40 or so mpg :flippa: