Gas vs diesel coach

I have two motorhomes. ONe is a gas class C and the other a diesel Class A. I put less miles on the C than the A by a huge margin. That is the reason the C is cheaper to maintain. If I was putting the same miles on the C as the A it would cost more to have the C. It is all how you use the coach. I change the oil in the Class A every 15000 miles and I change it in the C every 5000 so that is three oil changes to one. I flush the tranny and change the fluid every other year in my class C and I change the tranny fluid every 75000 miles in the Class A. So it depends on how many miles you drive. I have over 300K in the class A and about 60K in class Cs. In fact I am thinking of selling the Class C and getting a B on a sprinter and a diesel engine again.