Compression Ignition Addict
Join Date: Aug 2007
Location: New Martinsville, West Virginia
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gearing is gonna make a diffrence.... if you get 3.73's, and lightly loaded like you state, you might see higher... but I doubt you'd top 18-20 MPG, most likely around 16-18 at best. Get a tuner like DP or TW with an econo tune, that and a light foot could be good for 2-3 MPG.
My work van gets about 10 MPG. But it's 11K lbs all the time, lots of stop and go, and 4.10 gears. And it's still a slug. I get about 12-14 out of the truck. Same gears, 9K lbs.
'99 E350 DRW Stahl 11' util box van, 7.3 PSD, stock. 138k SOLD
'00 F350 extcab, 9' utility bed, dually 228k
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E'99 F250 extcab, S/Bed 211k. Sidelined due to motor issues.
'00 Excursion Limited, 7.3PSD 294k
'84 Chevy K-30, 6.2L TD, woods/trail beater. 141k