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12,000 miles annually and an average of 20 mpg, a car will consume 600 gallons of gas in a year. Even at 30 cents difference a gallon as quoted, the annual saving of using 87 octane gas is only $180. I think most car enthusiasts will not mind to pay that to gain extra 7 HP.
Fast and sophisticated as modern knock sensors, it is still a reactive process. It retards the timing only after a knock/ping has occurred. It is a “protective” feature like PSM. I am not sure it is meant to be activated regularly. The car’s computer should be re-programmed for 87 gas instead.
It comes down to just a sale pitch to bait those penny pinchers that like to drive premium cars but don’t like to pay for premium gas.
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