Diesel motors are a twice the investment at first (mabye) but if maintained well can last literally 10x as long as a comparable gas motor. Plus the fact that they are lower maintenance, easier to tow with, and they increase the value of your vehicle and hold the value better. For example I have a 95 dodge 2500 5.9 cummins manual tranny, 4x4, etc. with about 140000 on it. The current market value for the truck is somewhere between 6000 and 8000 dollars depending on where I try to sell it. A comparable gas truck is somewhere around 3 or 4 with lower miles. And i regularly pull 17-20mpg everywhere I go (and diesel is cheaper than regular at most gas stations). Theres no downside to diesel anywhere I look.