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Originally Posted by y5choi
sunoco is part of the "toptier gas" retailers and that's why I pumped that in but it turns out that being top tier does not necessarily mean they don't mix in more than 5% ethanol (BMW recommends no less than 95% mix i believe.)
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Yeah, Top Tier is just one aspect of good gas, but it is hard to tell who has the freshest gas with the leat amount of ethanol. Top Tier brands are a good guide to go by if you can't determine the other aspects of good gas. Overall, I would feel better getting Top Tier gas than other gas that I have no clue about.
I was under the impression that the ethanol content can vary regionally and some people really might not have a choice as to how much they get?
I know in my area it can be as much as 10% according to the stickers on the pumps and I am pretty sure BMW recommends 10% or less.