On average how much money do you think one car without a human driver could generate per hour for the company, and remember the company is getting the full fare,
For fun let's say the car could only be in service 16 hours a day because as you say it needs to be cleaned and service and let's say the car could make for the company 80 bucks an hour and I think I'm even being conservative with that figure,
$80 per hour at 16 hours per day, 7 days a week
1 month is 4.33 x one week
= 484.96 hours x $80.00 = $38,796.80 per month
$60 per hour would = 29,097.60 per month