[Agent_4573]

I'M NOT SURE ABOUT THIS! but i believe that 93 octane would be the best for your car. I know some engines don't like the higher octane but i know that I try to use premium as often as possible and love the results. You should probably get PKRWUD's opinion since he know just about everything. Something i am sure about is that it is normal for the gauge to go above full. When you "top off" the tank you can actually fill the fill tube so the gauge will read above full until you use the gas in the fill tube, then it will read "normal full" when only the tank is full. I'm sure that you could go below 1/4 tank without filling up but why would you want to? The last quarter of tank has all the settlement from 11 years worth of (sometimes) crap gas. Filling up before with a 1/4 tank will help prevent some of that from getting stirred up and clogging your fuel filter or in the worst case getting past the fuel filter.