No Pay For Driving Time Or Computer Time for On-site Technician

[Mycar]

Can an employer hire you as part time hourly wage worker (not a contractor) in, the Great State of Tennessee, and pay you only for the time you are on site, per their scale of how long it will take to do the computer repairs, which is always 1 hour, with no more time added if it takes longer, which it commonly does, and also not pay anything for the driving time to get to the customers location, or the time required to get the service calls off the internet and the time required to close the calls on the internet?
Heres an example of time required to do a call on a day when there is only 1 service call to do, so I am only payed for 1 hour but it took 6 hours of my time:
I get on the Internet at 8:30 and check their web site and receive 1 service call. I print the service ticket on my printer and then go to a web site for a map to the customers location and print this out. I finish this computer work at 9:00, get in my car and drive for 1 hour to pick up the parts at the designated parts shipping location, which is considered my office. I then drive 1 hour to the customers site to install the replacement part and am asked to make sure the repairs solve the problem. It doesn't, so I have to call tech support and relay this info and they have me do some things until they decide to send a different part. Because things didn't go as planed I'm on site for 2 hours instead of 1 because the tech support made a bad guess as to the problem to start with. I then leave the customers site and travel back to the shipping depot to ship parts back as required, which takes 1 hour of return driving time. From there I have 1 hour driving time back to my home. When I arrive I have to get on the Internet with my computer and spend 30 min.s more closing the call out of the companys computer system as required.