Posted by MarkB_MI on August 15, 2010 at 06:44:16 from (166.203.250.97):
In Reply to: Re: I hate alcohol gas posted by blue_tractor_man on August 15, 2010 at 06:06:30:
The thing to understand is that gasoline isn't "pure" anything, it's a blend of compounds that are combined to get specific properties. Anti-knock, starting, emissions, and detergency are all factored in. Some of the things added to gas raise the vapor pressure, other things will lower it. Generally RVP is higher in the winter for good starting, then lower in the summer for reduced vapor locking and evaporative emissions. If vapor pressure isn't specified, refineries will go for a higher VP if they can get the other desired characteristics for less money that way.
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