GAS vs Diesel??
You first have to answer the question ? why you are buying a truck, to tow a RV or not to tow an RV! If the truck wil be towing approximately %50 of the time, then go with diesel. If you are only towing 1 or 2 times a year, then go with gas. Another advantage to diesel is having a "Exhaust Brake" which makes you RVing safer. Be aware, you can't buy a regular auxiliary fuel tank that is built in your truck for a gas engine. Yes there are some auxiliary fuel tanks for gas but there are not the same as a diesel built in tank. Check Transfer Flow in Chico Calif. I am now on my 3rd diesel fuel tank from Transfer Flow. The make and instal the tanks in 1 day.
