I have an old ('98) sports car. Just turned 200,000 miles. Will still do 140 if I push it. ALWAYS use real gas, except when away on business. Lot's of places in Oklahoma use "Real Gas" as a selling point.
Lots of ethanol free gas here in Louisiana, and usually not much more at the pump than the corn juice. I use it religiously, and about the only time I don’t is when I travel out of state.
I’ve got PureGas for iPhone, an app that finds it when we’re traveling out of state for matches.