Pump Gas
Yes, pump 91 premium. But would be more impressive if it ran well on 87.
The problem is the regulations on pump fuel. They can vary from state to state but the commonality is that low grade pump fuel can have (and usually does) way more fillers and junk, more detergents and other additives that I can’t think of than premium pump fuel.
The regs for premium pump fuel are much more strict. They (whoever is blending the fuel) can’t just add in a bunch of cheap fillers and send it.
Even premium pump fuel has a bunch of detergent in it and like I said other stuff but nowhere near what the low grade fuel has.
Even if you are going to run an additive to clean the fuel up a bit (they make them and if you are going to beat on a pump gas engine especially if the RPM will be over about it 6000ish you should probably use one because the burn rate of pump fuel isn’t designed to use that much or more RPM) you have to make sure it is chelated. If it’s not it may raise the octane but it won’t clean up the additives in pump gas.
Most of this is going off my memory from however long ago OBDII came along, because IIRC when that hit they changed the formulation of the fuel.
I know I’m pretty close on it though.
