Quote:
Originally Posted by Gregte
Another advantage big trucks have over our American cars is that the diesel engine is more efficient in producing power than the gasoline engine. this is due to the higher compression ratio that a diesel can and does run at.
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Don't forget that semi diesels are turbocharged, too. This effectively gives them variable compression.
You will also notice that semis tend to have driving habits that somewhat resemble hypermiling, but it is mainly due to their having to move up to 40 tons of tractor and semi trailer.