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It's hard to make an accurate test just driving tank to tank because of all the variables. Plus, E0 is only available in premium as well so octane is higher. I tried a few tanks of premium but I have not been able to confirm any significant change on a tank by tank basis, so I have not made a change to premium.
What I can say is this province only officially made the change to E10 regular a couple of years ago, before that we were getting straight gas as far as I know. In the last two years my annual mileage has dropped 3-4% Considering premium is 10-12% more expensive, I see no advantage.
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Almost all my driving is done 1-5 miles at a time.
Best short trip: 2.4 l/100 km, 3.9 km
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