Anything 91 or higher is 'premium'. If they offer two grades 91 or higher the other is 'super premium' or 'ultra premium', Ultra94 in the case of Sunoco.
Funny, around here Shell's highest is 91 and neither it no PetroCanada's 91 run particularly well in my Cooper. Similarly, Shell 94 doesn't run that well -- good power but poor mileage and some engine stumbling. Esso 92 and Pioneer 93 seem to work quite well lately, with the power edge to the 93 and the gas mileage edge a bit to the 92. I should test Sunoco 92 again since 94 seems not that good.
If you don't really give 'er then you are fine with 91 but if you run above 5500 RPMs you'll likely notice a difference with 92-93 instead of 91. The computer seems to retard things a bit over 5500RPM with 91.
Harry
MINI Cooper Cabrio: now the car with go cart handling really feels like an open go cart!
"... the only man that can come home at 3 am in the morning without getting into trouble with his spouse is the owner of a British sports car!" -- Phil Bailey |