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Old 09-30-2013, 11:06 AM   #4871
Scooby Specialist
Member#: 313575
Join Date: Mar 2012
Location: SF Bay Area, CA
2012 Impreza 2.0i HB


Originally Posted by hemophilic View Post

28.9 mpg with 89 octane. Filled up one more time with 89 to see if the trend can continue.
this is great info. i await your results, but that looks promising and maybe it's something i can try.

i had never thought going to 89 with E10 would improve things over 87E10.

your driving looks similar to mine (26-28mph average on a typical tank which i usually guess-stimate at around 75-80% city in my suburbia type of driving -- hard to pinpoint though as i know some of my stretches of freeway are 1-3 miles which basically doesn't mean highway since so much fuel is spent accelerating up to 65-70 and then i'm back to the brakes and city driving shortly after)

anyway, i think i may have to try this out. it seems you are getting 6% increase in mileage?

that's not bad if it's only 10-15cents more per gallon.
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