Some RV owners seem to have a competitive nature and so don't mind the extra initial and ongoing cost of ownership of diesel powered motorhomes vs gasoline power. Class C rigs usually have front mounted diesel engines some of which are noisy idling which may not bother some users. Much increased fuel mileage of diesels can be significant if you drive (A LOT) more than the average 5K miles per year. Availability and cost of service on the road is another consideration. I should "butt out" but I don't plan to upgrade from our Tioga 26Q for any reason.