I’m gonna trust the multitudes if studies than someone telling the rest of his peers to be better.
Look, you don’t need a paper or a PhD to understand this:
When I was driving, I got paid roughly 60c per mile and then got more for time, a one time fee and tips. But baseline 60c per mile. It costs 20c to 25c per mile to drive a Toyota Corolla. Yes, that includes all expenses. It’s the cost of insurance and gas and the cost of buying a new car when the old one is at end of life. Nobody is losing money doing this. It isn’t rocket science.