Originally Posted by
Mr_Mercenary
I was surprised to find no difference in fuel mileage between the cheap ethanol based Husky 87 or Shell 87 vs Chevron 94 octane.
I read on one of the many threads, that someone got a lot more mileage running on high octane gas. So I ran a few tanks of 94 octane at high, high prices and was surprised to find literally no difference in mileage or performance. In the end, it is a "fuel good thing" (pardon the pun). My Micra has 26,000km on it. I'll try again when I have 100K and see if there is any reportable difference.
but did you try shell m91 with no ethanol
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View my fuel log 2015 Micra S manual: 7.7 L/100 km ... 36.8 mpg (Imp) ... 13.0 km/L ... 30.6 mpg (US) ...