I can't say enough good things about my Fit! I've transported dozens of machines in it, and generally get around 40mpg with 95% highway driving. For standard Bally/Williams/Stern machines I do not have to put the driver seat all the way forward, however, transporting a Haunted House made me drive like I was in a clown car though with the seat as far forward as it could go. I've even fit a complete RFM, body and head, in the car by rotating the body sideways! The only machine that wouldn't fit for me is a Bally Strange Science. I had to de-head it.
Loading is not a problem. I use some leftover laminate flooring boards to help slide machines in since there is a bump where the seats fold down. Cardboard will also help, but not as well.
Unloading is slightly difficult since the machine needs to be lifted over the lip of the trunk. I generally can do it myself but sometimes need help depending on the machine. I've been thinking about building a small wooden wedge ramp for the back edge so I can slide the machines out instead of lifting them.