How bout a cummins that runs 11.9's in the 1/4, is a 4x4 long bed extended cab with 35" tires, is daily driven, and pulls over 20 to the gallon running 80mph? Oh yeah, that's on the stock internals. All he's got done is some head work, a new cam, a BIG set of twins (around 80 psi and they are full spooled by second gear), a LOT of fuel, and a race built auto. No nitrous, no propane. Just good old fashioned #2 diesel. And that's not even the fastest street legal Cummins. The fastest street legal PSD is a reg cab, short bed, 2wd. His name is David Lott and he is in Houston. He's only running high 12's. There are a LOT more cummins in the 12's than PSD's. The fastest Dmax I know of is owned by ATS and is running a high to mid 12.

Diesels are bad mothers. You can dog em, rag on em, do whatever you want and they will keep on ticking. I know guys who are pushing over 800 hp and over 2000 lb.ft. of torque out of their engines, and have over 200K on them. They still run like brand new. The diesels of today are getting better and better everyday. The technology that is going into them is amazing. The variable vane technology on the Fords (and soon Dodge) is absolutely incredible (VGT has been out for a while in big rigs, but not in normal trucks). Each injector controls it's own timing and pulse width and stuff. Not only does that make for a very nice power curve, but the mileage and potential for power is down right amazing.