Quote:
Originally Posted by Josh (PA)
do they change from summer to winter gas formulas down your way? Might just be coincidental timing.
The difference between summer- and winter-blend gasoline involves the Reid Vapor Pressure (RVP) of the fuel. ... The US Environmental Protection Agency (EPA) says conventional summer-blend gasoline contains 1.7 percent more energy than winter-blend gas, which is one reason why gas mileage is slightly better in the summer.
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Excellent observation. I didn't even think of that.
Yes, we usually change to a winter blend here and performance does exactly what you have written.