Trying to make a buying decision based on the cost of operation between diesel and gas is quite frankly futile. If you can compare the chassis and exact coach with the only variable the engine you may
get pretty close. Seems to me as two others have said the coach is important but so is the driveability and layout in the front since most B owners spend a lot of time driving. Most folks would benefit more by concentrating on their purchase price then worrying about thecost difference between gas and diesel!