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... I've always heard gas stations get their midgrade gas, by pulling from the lower and higher grade gas tanks. Don't know that for sure, but if so you could probably find a place that sells high octane race gas and buy a couple of gallons to mix in with what you have.



That sounds like a big 'wives tale' story.

Gas is very regulated and monitored. No way of blending high and low octane at the pump.




That's how Sunoco stations did it back it the days of Sunoco 260. You had a 8 choices of octane from 190 to 260 just by setting the pumps handles.