Are gas octane grades all a scam? 🤔

Gas stations only have 87 and 91 octane tanks in the ground. There is a blending valve in the pump that mixes 87 and 91 to create 89.

If you have a high compression engine designed for 91 octane (like a turbo), i do not recommend putting 87 into the engine. It will run but you run the risk of knocking (pre-ignition) at best the engine will retard timing/power.

87 and 91 are mixed in-line to make 89.

Middle is a mix

that might be just that one.

Everything is a dang scam!!!!! Everything

Maybe

humm.

89 is a mix of 87 and 91.