[goatman65]

Originally Posted by MikeNoun

This photo needs no explanation as to why it's so cool...

I gotta ask, How did those pumps pump the different octanes? Were there separate tanks of octane booster that mixed in as the gas was pumped? Surely there was not a tank for each octane offered. I remember those pumps but never used one.

[Go-Tee-O]

Originally Posted by goatman65

I gotta ask, How did those pumps pump the different octanes? Were there separate tanks of octane booster that mixed in as the gas was pumped? Surely there was not a tank for each octane offered. I remember those pumps but never used one.

As I recall, they had a tank full of the cheap stuff (190-200) and a tank full of the good stuff (260). In between, you got a mix of the two.

My dad worked at Muldoon's Sunoco in Scotrun, PA as a second job around 1981....they had a standalone pump for that still-newfangled "unleaded" stuff. It was only like 85-86 octane!

[Jack Gifford]

Sunoco was the main retailer of the custom-blended gas. The remaining stations around here that were custom-blend Sunoco now sell custom-blends of E10 and pure gasoline- 10% ethanol, 5%, 2.5%, 0%- with octane ratings of 87 - 93.