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My 350 Gas 1993 Suburban historically got around 18-20mpg on the highway and about the same in town if you screw around a lot. Near the end I was getting around 24mpg on the highway loaded down with a generator off the back just by letting the thing slow down and speed up, sweet spot was around 70mph but not going up the hill.
My suburban has slightly better aero than your truck but not much, I should think it possible to get better than you are doing, someone should figure out why 93's always got better than the 92 and 96 year suburbans. Gearing, computer, transmission, not sure. I do know in town you have to accerate quick and coast a lot, suido pulse and glide helps.
Also I have been able to coax 20mpg in both in town and highway driving out of my auto dodge ram 1500 crewcab 318 V8, I found that shift to neutral dropped fuel consumption instantly down to the idle level and the truck coasts well. But I got a check engine light after doing that a lot about massive vacuum leak, went away after that without coming back.
Autos CAN be hypermiled but each one is different and you need to do things that are NOT intiutive to coax them into performing, my buick is that way, I found that I have to let off the gas periodically on the highway to keep the FE high because the car's MPG starts to lower after a while of steady state, I then have to wait for the GPH to drop (its like it gets stuck at .75gph when I let off the gas), Anyway let off the gas, wait and push the pedal back in and FE goes back up, strange.
Cheers
Ryan
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