this post was submitted on 01 May 2024
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Found it. Since the gas goes through the same hose as the other blends, if you're buying gas you need to get at least 4 gallons so the previous gas flushes out what was left in the hose from the previous sale, and fills enough of the container that the blend is primarily what you selected.
If you buy E15 and fill your tanks, then the next guy buys E10 and only gets 1 gallon, they might end up with a higher ethanol mix than intended, and if they use that on a small motor, like a chainsaw, it could ruin the seals.
I'm not from the US so my biggest surprise here is that you don't get separate hoses for each grade.
Imagine getting Diesel in Germany. “Sorry, that was actually 15 liters of regular gas. ¯_(ツ)_/¯”
Edit: Ok, it’s not as bad as I imagined, since this picture seems to be about E15/E10, not diesel/regular.
diesel absolutely DOES get a separate hose, every time
Diesel are often entire separate sections of the gas station.
Most of the pumps in the US have the same hose for 87/89/92 octane pumps that are E10 (10% Ethanol) and if there is a higher ethanol like E15 or E85, they're usually a separate hose.
I've seen pumps that have individual hoses for each octane grade in the US, but they're definitely uncommon, at least where I am, and I believe more prevalent on older pumps. But diesel always has its own hose.