A Brother-in-law is in the business. As I understand gas station pricing it is pretty much this.
What are stations within a mile or so of you charging, and since your (the stations) fuel tanks only hold a few days of gasoline, what is the next batch anticipated to cost?
Unfortunately the retail gas station owners are not making skads of money while the price goes up.
I can give you my thoughts on how to resolve the problem, but then I'd be accused again of just being an outsider trying to tell you what to do.
Visa or Mastercard?