I bought and then ecomodded a
2010 Honda Insight in late 2016 in order to drive for Uber and Lyft. I spent, taxes and stuff included, about $6700 on the car, it had 86k miles on it at the time, now it's got 135k miles. For a while it was my only vehicle. I still have it, but I stopped rideshare driving a little over a year ago.
The Insight is pretty good for Uber//Lyft but maybe a little on the small side. However, saving on gas is where it helps you. I don't think you can be profitable with ride sharing if you aren't getting at least 40 MPG. You need one of these or a Prius. EVs won't work if they're low range. (<100 miles) The only exception would be a minivan because with that you can get higher fees for large groups of passengers, but I've never done that so I don't know how common that is.