[ExI] Fuel efficient car for anywhere but America

spike spike66 at att.net
Tue Apr 12 02:54:08 UTC 2011



From: extropy-chat-bounces at lists.extropy.org [mailto:extropy-chat-bounces at lists.extropy.org] On Behalf Of kellycoinguy at gmail.com
Sent: Monday, April 11, 2011 11:49 AM
To: ExI chat list
Subject: Re: [ExI] Fuel efficient car for anywhere but America


I heard that there is more energy in a gallon of diesel vs. Gasoline. Is that true?

Miles per dollar has always seemed more interesting to me than MPG.


-- Sent from my Palm Pre

Actually it depends on how the question is stated.  A Diesel engine converts more energy to useful work from a gallon of Diesel fuel than a gasoline engine converts from a gallon of octane, assuming the Diesel is loaded optimally.  Octane burning engines are actually more efficient than Diesel when very lightly loaded.  This is what has me thinking small turbo-Diesel engines spinning generators at constant speed and load to hold them in their most efficient rev band.




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