We just took a trip out to OC in our E-450 Four Winds 31E, for our eldest DD's commencement. The total trip was ~290 miles and we pumped 42 gallons when we got back. I use Cruise Control on highways and did 70 out and 65 back. We also ran the generator a lot. From all indications (Cummins Onan 4k) the genny uses ~.5 gallons an hour of use at full load. We ran the genny a lot on the way out, there, and none back. I think we would have gotten better milage not running the genny. We are about to embark on a trip to San Fran so we'll see about milage better then. We are going to run a Champion 4k portable genny instead of the Onan for boon docking. Bad experience running the Onan overnight.
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