93 Chevron Techron here +
1.5 oz of ETHOS FR....
45 MILES MORE PER TANK BABY!!!! 
my last car was an accord and for 2 years i used nothing but exxon 89 in my car. took my car in for a tune up and the mechanic said wtf gas have you been using in your car? it's filthy! and that's when i switched to chevron. but technically exxon and chevron are the same co and the prices are comparable, but cheveron's usually a couple cents more. anyone know how they formulate or refine them differently????
