E10 was introduced about 1-2 years ago. You have been using it all along, just some stations are lazy about putting the sticker on the pump.

Yep it does suck, you cannot store it for more than 3-4 months.

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2006 CL500
1969 280SE
2023 Ram 1500
2026 Genesis GV70
2007 Tiara 3200