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Jul21-08, 12:54 AM
I think the MPG in those big rigs are actually pretty good because as long as they stick the the speed limit of 55mph, the consumption is pretty low. Actually, I think trains (GE engines) are the ones that are really really good with their big diesels (Probably V10-12).
If everyone actually drove the speed limit on the beltway, they could reduce fuel consumption dramatically. The power changes with the velocity (cubed, I think). So it takes a lot more power for small changes in speed.
10 mpg is about tops for it i think haha, not so good.