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I think it has to do with the gearing in the transmissions. Some of the new cars I have been in are at 3K rpms doing 65 mph. If we lost a bit of acceleration with taller gears we could see some larger mpg improvements.
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Peppy
2011 BMW 335d
1988 Targa 3.4 
2001 Jetta TDI dead
1982 Chevette Diesel SOLD 
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