you won't feel a difference, you might hear a difference. If the octane is too low, then the engine can "ping" that's a bad thing and could damage your engine.
An octane booster can make a difference. In case you're unfamiliar with octane boosters, they're designed to improve fuel stability (less explosive) under high compression by increasing the octane rating of the fuel you're getting at the pump. While they certainly aren't necessary for all engines, those that call for a higher octane level than is readily available will see significant improvements in performance and efficiency when octane boosters are used.
Boostane octane booster is a reliable brand and is available at Amazon.
See this chart for mixing levels.
doesn't take much , about 1 ounce does 3 gallons of 87 regular fuel for 91 octane application.