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Truth man, when i bought my car it had regular in it (f-ing dealership) and it ran like balls. Idled low, stalled, all kinds of problems. First fill up i used mid grade because the it was all the way on the right where premium should be, Didn't get much better. But i immediately felt the difference when i filled it up with premium the first time, and the low idle problem went away as well. I would NEVER put anything other than premium in my car after that, I even went through the trouble of buying octane booster when the gas station i stopped at was out of everything but regular.
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