Quote:
Originally Posted by mahout
That is also true here but in Europe the cost penalty for using premium is much less economical thanks to $8 and $9 a gallon gasolines.. Its cents per mile that counts.
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Even if my mpg increase is zero, a 2 or 3 horsepower improvement is attractive to me. I'll somehow find room in my budget for the extra $2 once or twice a month . . .
But getting data that shows it actually results in extra power is going to be more involved. Maybe I'll check around my area for any events that might be running a dyno-day discount or something . . . run the car to almost empty on one grade of fuel, do some runs, then fill it up with the new grade & do a few more runs. And pray conditions are comparable between runs that day.