Originally Posted By: UTAlumnus

Last fall it was running about 10 cents more per gallon. I'd heard the mileages for diesels were better but the last comparison I did for diesels was motorhomes. The couple that was looking at them was averaging 10+mpg with a gas model. The EPA numbers for diesels at the time were about 8.


In RVs the gas engine is often much less powerful than the diesel (~350hp to ~500hp). The diesel is often a more powerful option, for people who plan on towing with their RV. Therefore, it's like comparing a 4cyl to an 8cyl. When comparing gas and diesel engines, you need to look at similar rated engines in power. The diesel is almost always ahead by a large margin.