NapaBavarian
Dually driver 6.9
My '66 Impala SS may have a Duramax some day. Considered a 7.3 IDI for a long time to stay with the old muscle car feel and sound. However, I think the DMax will win out for ultimate power and economy. I'm thinking I could pull in 35 Mpg in a car that light (well lighter than a 7K truck anyway) and still pull 12-13's in the quarter...mostly stock. Now about that time and money thing...
Tom
My Dmax with overdrive and 3.73s gets 13-15, once 17, the 6.9 with a T19 and 4.11 crew cab dualie 12.5-14 once driving slow 19, the Dmax wins for power, but economy, the higher compression N/A with a light puff from a hair dryer seems to win fuel economy.