Say initial cost of the electric self driving car is $50,000. It has life of 20 years. After 20 years, value will go to 0.
Per year: $2500
Service per year: $2500 (HN mechanics, is this reasonable?)
Miles travelled/ year: 50,000 (5x human utilization)
Miles/Kwh: 3 (based on tesla efficiency)
Avg electricity cost in US: 12c / Kwh
Cost to drive 50,000 miles: $2000
Total / year: $7000
Cost per mile: 14c / mile
Average trip length: 7 miles
Cost per trip: 98c (very close to $1)
I think this is definitely possible.