Try each of them ...
... too much octane can actually slow you down.
Higher octane does work better in high compression engines... however you risk pre-ignition and knocking.
~ ~ ~
Van Eyes - slightly trimmed, Sylvania SilverStar ULTRA head lamps, Red (port) & green (starboard) 5 LED 'headlight horn' lights, PIAA silicone windshield wipers, K&N Filtercharger (in stock air box), MacNeil WeatherFlectors, Assorted cargo nets from previous vehicles, Optima red-top battery, Transmission Interceptor, 20 LED 'light tower' turn signals & brake lights, 18W PIAA W2 running lights, Trooper skid plates, Black Luverne step bars w/Tone's custom brackets
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