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Would a diesel, which is not "throttled" when coasting, not be more efficient staying in drive during coast? I thought if you let off the go pedal you were theoretically getting infinite miles per gallon until you stop. Idling uses fuel, but letting gravity turn your engine does not. I could be wrong on that though.
An expensive one, but have you considered swapping in a six speed?
Tried fuel additives? ATF, Lucas oil, WVO?
If you don't need the lift and off-road tires, lose them. A coworker's gas Dodge truck dropped from 11mpg to 6mpg when he lifted it. He now drives an 05 Cummins.
How about a tonneu bed cover?
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