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Old 12-06-2010, 10:40 AM   #151 (permalink)
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Originally Posted by dcb View Post
diesels are also throttle-free, and have high compression ratios, and direct injection these days, those help too.
Agreed dcb, those are incremental improvements but the energy content difference is the largest factor, in my opinion.

The kwh value of a gallon if diesel is considerably higher than gasoline using the same method of measurement.

I worked for Mercedes when they went from throttled to throttle less in 1982. They calculated it resulted in a 7% improvement in mileage. Those were prechamber engines, but were otherwise identical. They had to add a vacuum pump to the throttle less engines to run the climate control and door locks.


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