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Am not sure if this is the cause but the gasoline manufacturers typically
have two different "mixtures" of gas summer and winter. They say that they
do this because the different conditions, primarily temperature related,
call for different gasoline characteristics for the motor to run most
efficiently. So they are being nice to do this because it helps the
customer._I can't help but wonder if one of the two mixes is cheaper to
refine._
Don Mathieson
Tulsa Community College
dmathies@tulsacc.edu