Interesting idea, but I think there's a glitch.

When I look at where I live and set 45mins, what I get is not fully covered by what I get for 50 mins. But if a place is within my 45min car ride, I would expect that place to be included to the 50min car ride zone. Am I missing something?

Screenshot: https://postimg.cc/image/vgw9mdr6z/ (blue: 45mins, red: 50mins)