[mywittyname]

Diesels have literally the worst powerband for automobiles, especially mated to automatic transmissions. Diesels have power down low in the RPMs, but that's never where you are when you need power. When you need to accelerate, you floor the throttle and the transmission downshifts into the upper RPMs.

They are good for accelerating 0-40, but they are significantly slower at 40+ -- which is where most people accelerate hard, like merging on the highway or passing.

When I merge onto the highway, I use 5500-7000rpms, when I don't want to accelerate quickly, I use 2000rpms. It's why I hate driving diesels: 280ft-lbs at 2000rpms is useless and only 105hp; I want 280ft-lbs at 6500rpms (345hp).

[MasterPI]

:) Please specify when you talk about small diesels. Non of that 0-40 acceleration is true for the 535 I mentioned in my previous comment.

[mywittyname]

No replacement for displacement does hold true for diesels. I've seen some crazy fast, crazy large diesel pickups at the drag strip. 3.0L is about the displacement diesels can start making power, anything below that the limitations of physics are holding it back.