Did I put in the wrong fuel?

[Shotgun!]

Shell V-Power is death.
SA is bad shit.
Holiday 93 is alright.
BP/Amoco 92 is best.

This is n00b shit.

[Shotgun!]

Non Oxygenated gas is gas without Ethanol. MN gas is E10. 10% ethanol. With E0 (Non Oxygenated gas) you will see better milage and more power. That is if you have proper octane...91 ain't it. If it's not at a high volume pump, like the Shell in Plymouth, it could be old gas and have lost it's octane. If decently fresh, it is better than 91 octane E10, I'm just saying you should feed that beast the good stuff if you are driving it hard at all.
Regards,
Reid