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Old 11-15-2012, 03:44 PM   #2343
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Join Date: Oct 2012
Chapter/Region: VIC
Location: YVR
2013 Impreza2.0i CVT
DGM (sedan)


Originally Posted by jd_24 View Post
I doubt ethanol is fully to blame. Sure it has less energy and all, but we have to burn it 100% of the time here in MN. 10% mix all year. Yet when the winter blend gas comes (still with 10% ethanol), mpg takes a good hit of about 3 to 4 mpg. There are so many additives in today's gasoline who knows whats the real cause.

I was gettting 35 to sometimes 37mpg this past summer. Now since mid October its dropped to 32ish. Ethanol content didn't change.

Did I read your calculations right??? Rour gauge says 30mpg and you calculated 23?? thats way off. Most of us are off by 1 to 3 mpg.
I was experiencing sudden high fuel consumption at around the time they legislated ethanol content in regular gasoline here in BC. I didn't take much note of it at the time, thinking that maybe it was my car getting "old" (an '01 Integra), but in retrospect, the timing was pretty close.

(EDIT: As an example, I was getting approx. 600 km to the tank (a 50 L tank capacity); when the new laws came into effect, I was getting closer to 450 km to the tank. The effect was so pronounced that it was noticeable when I was starting to hit empty faster even though there was no change in my driving style or routine.)

You are reading my calculations correct, even though I am using the wrong units. I'm using between 500 mL and 1 L more per 100 km than my meter is suggesting (approximately 10% difference). This translates to about 2-4 less MPG. This would be approximately in line with your experience.

(I'll go back and correct the incorrectly calculated figures...)
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Last edited by lymphomaniac; 11-15-2012 at 03:53 PM. Reason: Providing example
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