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During the winter air is colder and denser therefor more fuel can be injected in the combustion chamber to burn. However the AFRs can be a bit more lean per unit of oxygen due to the lower temperature so overall fuel economy should be roughly identical.
Winter gas has a higher Reid Vapor Pressure (52psi) due to an increased amount of cheaper Butane. This is allowed because the cold air prevents an over abundance of vapor buildup in the gas tank. Low Butane blends during the summer have only a 6-7psi RVP. The addition of other more expensive chemicals used to replace the Butane increase the price of Summer gas.
The Seasonal gas program is designed to reduce evaporative emissions and will not affect fuel mileage or overall power. Any change in fuel consumption will be due more to temperature and air/fuel mixture variations between seasons.
"And the dynos rumbled, and God spoke 'Take thine Hemi V-8, install it upon thine
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, and pwn the many ricers!' And thus Challenger, son-of-Dodge, begat of Daimler began to dominate the rear drive world. And God looked down upon it and saw it was all that and a bag of chips"
"The Chevy Volt is not really a hybrid because it is always powered by bulls%^t!"