Coffee from convenience stores is such an underrated gem! I've tried so many chains, and honestly, 7-Eleven's brew surprised me the most. Their medium roast has this smooth, almost caramel-like finish that doesn't taste burnt like some gas station coffee. Plus, you can customize it with their creamer station—I always go for the hazelnut syrup and a splash of half-and-half.
Lawson stores in Japan are another level though—their 'Machi Cafe' line uses 100% Arabica beans, and the hot cans stay warm for ages. It's my go-to when I need a quick pick-me-up while browsing manga magazines in the aisles. The vending machine hot coffees at FamilyMart are solid too, especially their 'Premium Gold' blend during winter months.