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Summer and winter blends of gasoline.


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For the majority of cars it doesn't matter.

The major difference in summer vs winter gas is its volatility. Basically its ability to vaporize. Winter gasoline blends are designed to vaporize more easily because cold air makes it harder for the fuel to vaporize. Remember, it's the vapor that burns.

 

The ECU may see a difference in oxygen content in the exhaust. But it will adjust to that within a few seconds.

 

You may have a problem running summer gas in the middle of winter on a below freezing day. You may have a problem running winter gas in summer on a 100° day. In the middle times you shouldn't notice a difference.

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