There are typically trash cans near the pumps. Just pump the extra in there. If someone ignores the no smoking sign they will learn a valuable lesson.
@Boutique wrote:
This is actually in violation of their Merchant Account agreement with the credit card processor. You can not tack on surcharges or institute minimum purchases for credit card sales (at least not overtly - you can give a cash "discount").
>>Actually, the problem arose when I encountered a station that required a $10 minimum for a credit card. <<<