Quote:
Originally Posted by POWERFREAK
thank you tree-huggers...because of you gas is more expensive and we get worse MPG in the winter.
The difference between conventional summer- and winter-blend gasoline has to do with the Reid Vapor Pressure of the fuel. RVP relates to the volatility of a gasoline. The more volatile a gasoline, the more likely it will evaporate as the temperatures rises; evaporated gasoline contributes to unhealthy ozone and smog levels. Summer gasoline has a low RVP and is less likely to evaporate when compared to the high RVP winter grade. The Environmental Protection Agency says conventional summer-blend gasoline contains 1.7 percent more energy than winter-blend gas, which contributes to the summer blend’s slightly better gas mileage.
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This is true.
I work at gasoline distribution terminal and I can tell you that there is winter gas and summer gas. We are only talking about the base product that comes from the refinory. Every spring we have to make sure we rotate our inventory and ship all of the high RVP gas before May 1 or face very stiff fines from the EPA. One year we had to sit on 2 million gallons of gas for the whole summer. You will get worse milage in the winter.
Ethanol is another story. It is always the same. We add 10% to every load wheather it is conventional gas or reformulated.