看不懂什么是油卡交易新规定。什么是求草啊，白菜啊？

谁能解释一下？

I have $1.55 off per gallon for 35 gallon or $3.05 off per gallon for 20-35 gallon shell gas, Minimum out of pocket at the station with the discount is 1.9 cent per gallon. It is expiring soon and I am wondering if I can sell it here.