May 3, 20169 yr Is there any truth in whether or not the ECU can tell the difference between summer and winter blends of gas? Does it need to re-learn that also?
May 3, 20169 yr assuming all sensors are working normally, the ECU can adapt to changes in fuel in a coupla drive cycles.
May 4, 20169 yr 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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