Re: id like to set something straight
you might gain slightly higher mpg but think about this. your revving higher for the same power witch in turn burns more fuel for the same speed. so in your case it was most likely a placebo affect. Also it depends on were your driving. the only way u will be able to test if it improves mpg is to drive on a track the exact same way with both fuels. like you said cross country so with the regular u could have been going up hill decreasing mpgs while when u were on the premium u the rode might have been flat or downhill thus improving mpgs. There is way to many variables that affect mpgs. but its you money so use it the way you want. personally I'm getting a motorized bicycle to save money so i will be using regular fuel.
And 2door I swear I can run faster after I shower =D lol. If people were to just understand why octane is in gas they would rethink putting it in the engines. I took only a HS shop class and learned why it is in there so it dosnt take much to learn it
PLEASE PEOPLE LOOK UP WHAT OCTANE DOES IT WILL CHANGE YOUR LIFE =D jking but seriously look it up.