Labour costs are much more important here. Utilizing an older car to 90% is cheaper than utilizing a new car with only 60%. That's where the advantage of larger players with good technology and data analysis lies, as they'll know when and where cars are needed.

Still, uber doesn't even pay when drivers don't have a ride, and they still lose a lot. I don't think you can be any cheaper than the subsidized Uber.

And I don't think you can save much regarding servicing. You already get very good prices with a few cars, or just with one if you carefully choose the garage. There is not much discount that you could get. Most costs will be gasoline, where discounts even for huge amounts are very small. So small that I know of several very large fleet operators in Europe which abandoned their own gas stations and instead had a contract with some gas stations to get a minor discount there.