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Do you have the source for that graph?
It would be good to know distance traveled, but that's likely impossible to track with any accuracy. Outside the lowest quintile I wouldn't be surprised if the 2-4x increased spending also included 2-4x as many miles traveled.
These things go hand in hand. The reason people need to own a car is precisely because of a lot of cities don't have amenities within walking distance. Hence you end up doing more travel if you live in a place like that.