Euro Fuels; RON versus (R+M)/2

AJ, all I can say is here in NY, my ‘03, 5.9 runs very well on 89. Not so much on the 87. The 93 does t make a noticeable difference.

600 carb on top of a rpm and hooker super comps headers, 2-1/2 exhaust. Chrome box fires MP distributor. Stock plugs.

Shamefully I see the pump very often and couldn’t tell you how the heck we rate the fuel or if it is even listed both ways.