-=> Quoting John DeMott to Mike Dale <=-
          [ ... text deleted ... ]
 JD> dissipated by heat. The additives package in the higher grade gasoline
 JD> does the best job of keeping an engine "clean" in both the upper and
 JD> lower end.
        I think it's well established by now that the same additive
package is used in all grades of gasoline of the same brand name.
        It is a matter of uncertainty as to whether what you said
was ever true, but there is no difference now in the additive
packages.
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