http://www.insingerperformance.com/products/turbo-blue/
Generally can't fill your street car up at the pump, but a few 5-gallon cans put you in business.
Otherwise I run 91 eth-free premium in my '67 GTOs.
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'67 GTO Hardtop Montreaux Blue 400/400
'67 GTO Hardtop Regimental Red/Black Cordova top/400/4-speed
'67 Bonneville Ragtop Montego Cream 400/400
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