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Old 03-29-2008, 11:53 AM   #6 (permalink)
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Originally Posted by MetroMPG View Post
[...]High vacuum at cruise is definitely the good guy.

There's a difference between lowest fuel consumption and best engine efficiency. With a typical engine at light loads, you'll probably get your best MPG well outside of your engine's best efficiency (BSFC) area.

Chapter 2 of this pdf is quite interesting. The distance specific fuel consumption map on page 14 is particularly relevant to steady state FE.

BSFC is most usefull to know when accelerating, but when crusing on the highway it's DSFC you should be concerned about.
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Last edited by tasdrouille; 03-31-2008 at 07:52 AM..
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