Bob,
Are your mpg figures based on the trip computer or calculated by hand? I pulled my 30 foot Avion from the Gulf Coast to the Keys last year with a 2000 Excursion 4x4 with a chipped (for economy) 7.3 diesel and my best tank yielded 12.5 mpg when calculated by hand and even given the 5% extra because the speedometer and odometer were off due to a slightly larger tire size. This was on flat ground and many miles of highway driving (not interstate) that should have provided about the best fuel economy possible. I hope your figures are right but I'm always concerned that people compare mpg using trip computers that are off by some order of magnitude. I did get 18 mph when I was not towing.
Incidentally, the Excursion was a great tow vehicle but we had sway when being passed by 18 wheelers. I used my 2005 F-250 crew cab diesel this year and got between 11.5 and 12 mpg towing the same rig on the same trip. I used a Silverado gasser with the 6.0 V8 three years ago on the same trip and got 9 mpg.
Jarrod
My next (and current vehicle) is a 2002 Excursion (7.3) auto, 4x4, it
gets 18-19mpg, and 16-17 towing. Not quite a good, but it can haul a
lot of people at the same time.
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