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- Jul 2, 2007
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https://www.quora.com/How-do-gas-st...tore-various-octane-gasolines-separately
The first answer in the linked Quora question seems to have credibility. I was afraid 89 mid grade gasoline sitting in it's own storage tank would get stale due to not many buyers of mid grade. But this info says that stations have only two storage tanks one for 87 regular and one for premium 91/92/93, and that when demand is made at pump for 89, a blend process is commenced that draws from both the 87 storage tank and the premium one and outputs 89.
Now, I have a question about this. I would think that the blend mechanism, if this is truly how it works, would need some periodic calibration to ensure that it reliably blends to 89 octane upon demand each time a customer selects mid grade.
Can anyone confirm this info about 89 being actively blended, i.e. created, upon demand when pumped? As long as the regular and premium stocks are up to snuff I suppose this works okay and what comes out of the pump actually tests at 89 ...