My prediction:
1) Yes, It'll sell gas but it'll also have electric stations.
2) Basic snacks and food but maybe more electric cigarettes lol
3) Only chips (either on your credit card, phone or under your skin)
4) Simplistic and white modern look
5) Cleaner restrooms as the robots clean every 30 min and no staff, more cameras with AI to detect anamoly and call 911 quickly.