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Old 02-25-2010, 10:31 PM   #1 (permalink)
Tygen1
Master EcoModder
 
Join Date: Dec 2008
Location: South Jersey
Posts: 553

Little Blue - '98 Ford Escort ZX2 Cool
Team ZX2
90 day: 44.75 mpg (US)

Big Red - '00 Ford Excursion XLT
90 day: 15.53 mpg (US)
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Question about the math for EOC vs Coast?

I've been trying to figure out what the benefit of EOC is without actually trying it.
The math I have done is based on my commute. 400 miles a week, average speed is 45 mph and my last three tanks average is 40.45mpg which approximatly equals a GPH of 1.11.
I Coast with my engine on for approximatly 10% of my one hour drive (6 min.). My normal GPH while coasting has been 0.22. So If I subtract the gallons of gas saved via. coasting (0.22gph vs. 1.11gph) then the mpg if I didn't Coast would be 36.9mpg and my average gph would be 1.22.
So lets say for the same 10% of time driving my engine is off (0.22gph vs. 0.00gph), then my mpg would be 41.56 vs 40.45 that I am currently at.

To sum up the math, if it is correct. It seems that Coasting benefits me by 9% and EOC could benefit 11%, or just 2% better than Coasting.

Does any of this make sence? It seems correct to me?

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