If the driver drove 600 miles and his car got 25 miles to the gallon, at $3 a gallon his gas expenses would have only been $72. Of course there are other costs (maintenance, depreciation), but those also exists if you are just driving your car around town, and I think Uber / Lift's whole business model is based on the driver not really taking them into account. If the tip was $100, the driver would have walked away with $330 in cash after the drive - which is not bad for a 10 hour workday.