The Dash Leaderboard
To access the Leaderboard, just tap the trophy icon on the bottom nav from the Dash home screen.
This is where you can compare your driving scores, fuel efficiency, and distance with other Dashers.
Note that the comparisons you see are by vehicle type: when you see "Top 17%," that's a comparison against drivers of similar make and model cars. You'll also see your Dash friends in the list, so you can compare your driving against theirs whenever applicable.