Quote:
Originally Posted by MadisonMPG
*did not read whole thread
Diesel is already more fuel efficient. Trucks have a higher load/Cda ratio. Stay at 70mph for nearly all of their trip. Made for hauling, not for city driving or spirited driving. So all of the gear ratios (18 or so of them) are made for highway. They rarely change speeds and they do all of the Hypermiling things because they have to.
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Also, diesel engines are thermally more efficient due to the diesel cycle and higher compression ratio. I just read an article on line about a new non-modified 1.6l VW that traveled 1500 miles on a single tank of fuel (20 gallons), or about 75mpg (average speed 45mph of course).
1,527 Miles On One Tank: Passat Bluemotion Sets New World Record