towpro wrote:
otrfun wrote:
The latest model HD gas V8's are pushing ~400+ HP with new 8-10 speed trannys. Late model diesels are also pushing ~400+ HP. 400 HP means they're both capable of doing the work. But . . . that tranny on the gasser will be constantly dancing around making up for the V8's lower torque on hills---not to mention that V8 pulling 3,000 - 5,000 RPM's while that tranny dances. If the sound and feel of this dance doesn't bother you, I'd go gas. Gas means less initial cost, cheaper fuel and less maintenance. If you're not fond of the V8's little dance, go diesel. Very few, if any downshifts with the diesel. As for the exhaust brake? Priceless!
This is true. But these diesel produces 400HP at 1800-2000 RPM which is the same RPM your running down the highway at.
the gas engine produces 400HP at around 4500 rpm so it must shift, and rev anytime it needs to produce power.
and I think engine rotations per mile is directly associated with fuel economy.
If you reread my post, I believe you'll find we're saying exactly the same thing--at least in terms of driving a gas engine. However, your comment about a diesel developing 400hp at 1,800 - 2,000 rpms, is incorrect. That' the rpm they develop max torque. Max hp is much higher, around 2,800 for a Cummins. 3,000+ for the PS and Duramax.
