Historically, there have always been three pumps that ran off of two tanks at the station.
There was a high octane tank and a low octane tank.
The three pumps delivered high octane (premium), low octane (regular), or a mid-grade (a blend from the two tanks).
It is still basically done the same way.
Last Sunday, I bought “non-alcohol” gasoline from a “high-test” (premium) pump at a Kroger.
no, that’s not right. In the old days there were only two grades, not three.
When I was a freshman in high school we had a local station that allowed you to “Dial” you octane.
Wish I could remember the name of the chain.
As I recall you could go from a low of about 85 (For a model T or A?) to a high of 101 (105?) for serious drivers.
I always ran the good stuff in my modified bike.
To this day I am severely PO’d to be forced to buy “Supreme” of only 92 octane, particularly at these prices.
At these prices we should be getting at least 100 octane!