Quote:
Originally Posted by Mxfrank
The engine control system will automatically retard the timing to compensate for low octane gas. So you probably won't hurt anything, but your mileage and performance will suffer. Sort of pointless.
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This. Exactly what I was going to say, except with a $.30 per gallon minimum delta between premium and regular these days, you won't lose enough mpg to make premium more economical. Back in the days of a $.15 delta it was a wash.