Well I feel partially responsible for this, so I'll do my best.
1. I believe they lose money, so technically a profit of 0.
2. Between 0 and 25 cents? I'm not entirely sure whether to approach this as gallon of gas imported, or simply a gallon of gas sold at an Exxon gas station, or whether there's a meaningful distinction.
3. Say $2.
[NB: my answers were clouded by the belief that I can guess what point you are making.]