Customer B buys 1 gallon of E10 from the same pump.
Customer C buys 1 gallon of E10 from the same pump and puts it in his chainsaw. If that gallon ruins Customer C's chainsaw, it's legally Customer B's fault? What the fuck?
Forcing B to buy more gas than he might want, to protect the customer after him, because of the customer that came before him, is some horseshit.