Spend the 2-3 bucks a tank and put in the good stuff, drive it like its stolen and have fun.
Others that have posted that knock sensors retard the ignition to avoid pinging are correct. So if you say, "I put in 87 and it doesn't ping" you are right. Because if necessary,(you wont know) the computer is cutting back on power/ignition advance to avoid it. You wont know what your car will do until you give it the gas to do it. You paid 30k for a cool car and try and save 3 bucks a tank ? Sheesh. JMO. You should have bought a Toyota Yaris. I hear Priuses dont knock either.
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From my cold dead hands......
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