Just like milk. E10 blended gasoline "spoils" or turns bad after 3 or 4 weeks in your tank. Trying to run your car on this bad gasoline results in rough idling or even engine stalling. Engine power is low if you manage a stable idle.
This is why you have to drain or replace the gasoline in your tank with "fresh" fuel if you have left it for months.
But non-E10 gasoline can last longer in the car's tank, up to four months and even longer without "spoiling".




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HTH
Thnx.
