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It is fairly well understood that driving slower will give an increase in mpg. One guy put up a charge showing 7 mpg at 70, 8 at 65, 9 at 55 and 10 at 45. Your rig was 16 k which is light for a class A. The 454 is not know for getting such good fuel economy and I am not clear on how you calculated it. When you put in $100 worth of fuel was it just a coincidence that it took $100 to fill it? Or were you not filling it and just making an estimate based on the gauge level?
Motorhomes often have 100 gal tanks and it is really difficult to fill them to the same level. It is very easy for me to be off 5 to 10 gallons on a fill up.
Best wishes,
Randy
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