Compression Ignition Addict
Join Date: Mar 2008
Location: Scurry TX
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You don't specify anything about the 2 trucks like rearend gears or model years. An older duramax would get extremely better mileage then an 08 F450.
To answer your question, in my opinion, you can not run a tuner, leave the DPF installed, and not have major problems down the road. You are going to clog the DPF and have to replace it. If you want better mpg on the new trucks, no matter what manufacturer, you are going to have to remove the DPF. The use of diesel during regeneration has to be stopped and you have to get rid of the backpressure from the DPF. Ford, Chevy, Dodge, VW, it does not matter, the new EPA laws are there and we have to deal with it or mod. it and deal with the consequences (sp.).
08 F350 6.4 auto, XL Supercab 4x4, camper & tow
95 F150 4.9 (300ci)
03 VW Jetta TDI (52.9 mpg lifetime) 183,000mi.
69 3/4 ton 4x4 Camper Special, 390ci.
53 Ford Golden Jubilee tractor (miles unknown)
00 John Deere 790 tractor/3 cyl. yanmar diesel/102hrs