While not a class c, my 16 vegas is still on e450 chassis. Past 4000 miles mpg improved a little from 9.4 to 10. Best was 10.7 towing trailer South on 75 at almost 70 drafting a DP. Worst was 1st Disney trip, 7.8 with Gen running and testing limits with nothing to get behind early on and a heavy headwind.
When road empty, big difference between 60 - 65 , 65 to 70, 70 to 75.
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