Me, I've always purchased whatever is cheap, least cost for 50+ years.
One of the few exceptions cost Shell Oil $1200 as I got close to a 100% dose of it. I could not understand how it could have happened. When checking the credit card statement, 24.8 gallons with a tank that held 25. It probably held a little more than the manual stated. I was desperate for any price gas at the time. That same vehicle had 206,000+ miles with original spark plugs, wire, everything - along with serpentine belt, radiator hoses....
Bud
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