We were told (at BGIII, I think) from the XLR engineers that the base models are okay with regular unleaded (though 91 or better is preferred), but the V series do require 91 octane or better due to the different compression ratio in the supercharged engine.
I confess that I have used both octanes at different times (in my base XLR), but I do normally use 93 octane, especially if I'm on a trip.
For us it's Chevron (Standard) .... or Mobil....I don't doubt your story for a minute, RA. Ohio does NOT inspect octanes on fuel (only volumes), and I've gotten some pretty crappy loads of gas!!
I usually stick to Shell gasoline whin I'm in-state; they seem consistently good. BP in Ohio?!? Only if you reallllly don't care what you get (they have a terrible reputation!)!!! I'm not as picky when I'm on the road, though I will pick a Shell station when given the opportunity.
Hess? I thought they went out of business a few years ago...
My brother-in-law used to collect their model trucks - issued around the holidays. Do you know if they still make them?