As others have said, there has been a lot of debate and discussion over the gas vs. diesel issue. Here's my two cents opinion for your entertainment:
I think an important issue of the gas vs. diesel debate is one that rarely gets any discussion: While there are, and have been, smaller diesel class A's, generally there isn't much direct overlap. That is, it is rare to find a direct option of the very same coach
with either a gas or diesel engine. The class A chassis will eventually run out of weight capacity much sooner than a DP, so at some point as a coach grows it must
be on a diesel chassis.
Generally, a DP will be bigger, more powerful, have more carrying capacity, have a longer lasting powertrain, might have better appliances and furnishings, and likely to be considerably more expensive.
Depending on your preferences for use, and how much you want to pay, you may find yourself in the "overlap" range of considering either a gas or DP, otherwise you might find yourself buying something bigger than you really want; just to get the diesel chassis.
On the other hand, most people who post here that have gone from gas to diesel claim they would never switch back.
There's no "one fits all" answer. I have a friend with a 40 ft. Prevost coach conversion and a giant stacker trailer, and he absolutely loves it. We tow a race car on an open trailer behind a 29 ft. gasser, and absolutely love it. He is challenged to find room and space wherever he travels, while my wife sometimes says "Chuck could never have done that maneuver".
Originally Posted by juliel
I am planning to purchase a Class A motorhome. However, I am not sure whether to go with a diesel pusher or gas engine. I currently drive a Class C gas and usually pull a Jeep Wrangler. I have averaged 8,000 mi/year with my Class C (mostly during summer months). I have heard that diesel engines should be run more often/more miles. I am concerned with getting enough power pulling a larger motorhome and jeep up hills. I would greatly appreciate any input and advice. Thank you.