I think the price in the states should be between 3.5-4$ per gallon regular/premium (?)...I don't recall race fuel prices as I never use that on rental cars
Canadian prices are way higher.
I guess (almost) nothing beats the german fuel prices... ~1.59€-1.69€ (95-102octane) per liter
(1 gallon US = 3,79l; 1€ = 1,37$ --> ~ 8,25-8,80$ per gallon)
For the few kilometers I drive my Boxster per year...i only use racing fuel 102octane... those few more dollars "wasted" makes me and my Boyster feel better, and the smiles per gallon ratio goes up!