[comegetsome2003]

OK so I read most of the post in this thread...I know it might not be in your budget right now but a Cummins swap is what your looking for.....my dually is a 91 model(square) CCLB....it has a 93 model 12 valve small pump motor in it with a 518 overdrive lockup trans in it....my truck has 29.3 Inch tires with 3.42 Gears(or so i was told by previous owner) and i got 20.7 Mpg last weekend on a 220 mile trip...my injection pump needs to be rebuilt cause i have a pretty good fuel leak that has developed lately....mpg would naturally go up without this leak...also gotta account that 4 22 inch semi wheels plus adaptors is extremely heavy on the rear axle...my motor is governed to 2200 rpm which is about 77-78mph....i run 70mph everywhere i go so im guessing 1950-2k rpm and its getting that kinda mpg id say prolly 24mpg if i slowed down to 55-60
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