Diesel is an OIL and takes less cracking and refining than Gasoline hence less initial product to produce.I have gotten away from gasoline and have no interest in going back.Any of your lightweightdiesels will last easily twice as long as a gasser regardless of MFG,will have less repairs per mile driven,and in a cost per mile for most Depts running over 300 or more runs a year will offer substanti