Nother thing used to drive me nuts was that there was a station owner where I live that would sell gas line anti freeze to the ladies that put gas with 10% ethanol in their tank!! Gas line AF is Alcohol; Ethanol is alcohol!! Freaking theif!!!
Correct me if I'm wrong, but unless you are tuned for running higher octane, it doesn't make a difference. Except to lighten your wallet.
You are not wrong...The tune is what it is all about and if your Jeep is tuned for 87, running anything higher is just throwing your money away as it will not help anything.
Now if you remap with some kind of aftermarket device, you may have to run 91-93 as it will change your tune to get the added HP.
We have Marine gas in town (ethanol free) but it is .50 more expensive than regular. The ethonol free gas is ALL I run in my lawn esuipment and motorcycles. Ethanol is nasty stuff and gums up small carbs really easily, let alone eating up the small plastic fuel lines. Corn is for eatin, not burning in an engine....
X2---- Most all small engine repair shops recommend pure gas (no ethanol) for all lawn equipment. I have found to get 1 to 2 mpg better mileage in my wrangler using it. We only have 1 place that sells pure reg. gas in my town and luckily it is only a mile away.