Another problem you might be experiencing is that sometimes the gas station is trying to provide fuel with a bigger profit margin, we had a chain of stations here in Iowa that was mixing E10 and E85 and selling it as E10. Some of the locals were noticing a dramatic drop in their mileage when ever they stopped by the stations and complained to the state that they thought something was wrong, the state tested and found on average close to 35% rather than the stated 10% in the fuel. Didn't hear much except the owners got fined lots but, not sure they stayed in business or not.
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