Most stations are self-service, allowing for lower overhead and faster turnaround.
– "Makro tanken" could figuratively mean consuming macros (carbohydrates, proteins, fats), e.g., a large meal or shake for bodybuilding. makro tanken
It looks like you're referencing — a German phrase that generally means "macro fueling" or "bulk refueling." Most stations are self-service, allowing for lower overhead