It's obviously more expensive but if you buy diesel to save money you are buying for the wrong reason. It's one of those things that you have to pay to play. I don't have to but I still do my oil changes at 5000 miles. They say you can go 10k. Much more frequent fuel filter changes, transmission filter changes, etc, etc....... Yes, it's more expensive, but if pulling big loads a gasser just doesn't compare. Now add in the exhaust brakes on the more modern diesels and just another reason they are far superior towing/hauling machines. Again, neither option is perfect, each has its pros and cons, it just depends on what is more Important to the buyer.