> With some vehicles (normally-aspirated as well as blower) you will hit a
> point in the engine-protection strategy where the resultant reduction in
> spark timing, etc. ends up costing you big-time in driveability or fuel
> economy.
I'm not suggesting you use it unless you need it, but I'd note that the
$.20/gallon extra for premium is, at current $3/gallon gas prices, a
smaller increment as a percentage of the total price than at pretty much
any time (well, except 2008) prior.
John.
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