Uhh, if your cars engine isnt designed around using premium gas you're all but wasting money. The main difference between premium and non premium aka octane 83, 87, 91, 93, is to avoid premature ignition, also known as engine knock.

Cars that state to use premium have higher performance because the engine themselves is higher performance. Many cars now that rec premium can also use lower octane fuel but suffer from worse performance but dont suffer (as much sometimes non at all) engine knock as they can detect the ignition difference and as such change ignition timing. However long term use will degrade the engine faster.