Hi, A few answers to you question, Fuel, Better with a derv, Reliability, Dervs are now cleaner, Loger services less cost to your pocket, life span depending on how you look after the motor Eg/ regular services etc,150.000+ Resellable, No comparison dervs are better & hold their price, Adavantage, No damp starting problems, A work horse will stand the hard slog of everyday life, History ask a local Comp what sort of miles their trucks do, the one I drove many years ago 200,000 no problem.