I know what some people claim on mpg, but fleet managers who count every bean say the diesels seldom do much better in the real world, and never good enough to make them cost effective. They deal with drivers who go pedal to the metal when moving, and then let it idle for 2 hours at stops. They only buy them because the workers ***** if they don't get a diesel to trim trees or whatever. I bought a 2005 Duramax because of such MPG hype but never saw anything worthy of writing home about. Power was great but mileage just a few ticks better then my 454 gas, no better then my 5.7 hemi, and I actually was/am trying to get good mpg. I would go with a 7.3 in the Ford world, stay away from used Sprinters with the modern DPF systems, fleet guys will tell you the big maintenance problems they get at 150-200k probably when you will see them used. I personally love the new Promaster because of its FWD and low floor in back. The 3.0 ecodiesel does get good economy compared to gas. Some Ram drivers get over 30 and I do actually believe them.
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