In my opinion, the engine type you choose (diesel or gas) depends a great deal on two things..First how much travelling do you intend to do and second the Gross weight (the coach, your belongings and your tow vehicle) you intend to move around. We have put 55,000 miles on our diesel coach in five years and at the last service (oil change etc) the report was "perfect operating condition". In addition diesel has the advantage of on board air tanks as well as very effective engine brakes. If on the other hand you are going for a lighter smaller unit the gas probably will suit your needs. Our unit is a 35ft Holiday Rambler Neptune (raised rail chassis, 4 air bags, 325 cummins diesel) and we averaged 9.8 miles per US gallon on our last year's 12000 mile trip from Ontario to Arizona then north through the mountains to Alaska and back to Ontario. That made for a lot of hill climbing and then back down. The very effective engine brake for down hills reduces the wear and tear on your wheel brakes. Just a thought.
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