[cleanspeed1]

There's still room left for tuning the engines, but like the cars the World market gets things that we need but don't have.

I'll give you an example on the engine front. Bruce Malinson over at Pittsburgh Power build high power truck diesels for big rigs. In the beginning, it was the old style Cummins NTC ( 855ci ) and KT ( 1150ci ) engines. Getting 800-1200hp out of these engines with 2800-3600 ft/lbs of torque, but the best part was the mileage usually went up 1-2 mpg because the driver didn't have to shift as often or go full fuel to drive it.

He now has a Caterpillar 6NZ ( 3406E / C15 single turbo / electronic / 14.6L ) that puts out almost 900hp, but in an unaerodynamic chassis ( Peterbilt 379 ) does 8-9 mpg loaded, 10 mpg or better bobtailing. The aero style trucks get another .5 mpg or so better.