Good for you! Happy Independence Day! 
(Kinda—they are your folks, my mother called me when I was 35 to make sure I had taken a warm coat to work b/c a cold front had come in…where she lived!)
I think there is something subliminal happening between the OP’s user name and this poster.
DPRK is the official short form of North Korea - Democratic People’s Republic of Korea
My senior year in college, I decided to move 1,000 miles away to another state. My mom was basically supportive and she knew I would be moving in with a friend from college who already lived there. So she insisted on visiting with me to see where and how I would live and to meet my roommate to make sure I wasn’t moving in with some exploitive creeper.
My dad told me it was the dumbest goddamn thing he’d ever heard and began to grill me: Where would I live, where would I work, how would I support myself, how would I get around, how was I getting there, who was helping me move? I had answers to all those questions and none of those answers involved action or financial contributions on his part. In short, I’d already thought it through and made plans and backup plans.
Basically, I demonstrated that I could make an adult decision and then plan it out and execute that plan like a grownup, so they wouldn’t have to worry about me or put themselves out to support me. It wasn’t like I expected them to pay for my phone and apartment while I lived the party-girl life at the beach. No, I had a newly polished resume and friends who could help me get job interviews and I wasn’t asking for nor expecting a dime from anyone.
So they STFU and quietly supported me while they let me go do my thing. I have never gone back and I never asked for money or help or anything. If I failed, I figured it out, picked myself back up, and put myself back together.
If you can say to your parents that you have a plan and you can show them a feasible, reasonable, do-able plan, then there won’t really be anything they can say.
So I’d recommend a weekend trip with your fiance to nail down the details. I call these “recon missions.” You are going to the city of your destination to find a place to live, look for a job, get yourself enrolled in school, whatever the plan is. You’ve saved up deposits yourself. You know how much it’s going to cost you to move, to get a new place, to turn on the utilities, to commute to work, etc. You already have that money in hand before you do it. See, that’s how adults do: we plan things out and then work the plan. (Well, some adults. Some are not so much good planners.) Show your parents that you’re an adult and you’re going to be an adult about moving across the country. Then, assuming you’re over 18, there won’t be fuck-all they can do about it, even if they won’t approve or give it their blessing. An adult would carry out the plan, if he thinks it’s the best thing for him, even without the benefit of his parents’ approval or blessing. If you’re willing to go through with this even if they do not approve, and you’ve got the means to do so all lined up, then you’re ready.
Funny related anecdote: Shortly before I moved, my grandfather, who apparently didn’t want me to move away, told me that, if you have a loan on a car, the insurance company won’t let you take it out of the state. I’m not stupid and that sounded like bullshit to me because people move all around the company all the time, whether their grandparents want them to or not. But just to be thorough, I called my car insurance company and said, “Okay, I think this is bullshit, but I’m asking just in case: is what my grandfather told me true? Will you cancel my insurance if I live out of state?” After the agent stopped laughing, he explained that I’d have to register the vehicle in my new state and that would require insurance in that state and nobody cared if I had a loan or not except the bank and they only wanted the payments, so as long as I did all that, it would be fine. And it was. And my hat is off to my grandpa for one last desperate attempt to keep me nearby. LOL Nice try, Gramps. 
He then proceeded to work on my mom, telling her all sorts of horrible things that would befall me if she allowed her 21-year-old college-educated daughter to go out into the world by herself to make a life for herself. Mom was great-- she was the buffer between me and him and didn’t tell me any of the things he’d said until a few years later, when it became clear that I wasn’t going to become some crack whore to make rent nor would I be coming home on a Greyhound bus after failing abjectly. None of that happened. And State Farm let me keep my car! 
Of course. We get melodrama, and they get a place to exchange coded messages. It’s a win-win situation.
Let’s see if we can break the code:
I live in Tennessee right now = I am currently in the South (South Korea)
and I want to move to New Hampshire. = I want to get into the North (North Korea)
I first suggested this to my parents = to my handlers
my dad = my local boss
(like helping pay for college) = subsidizing my Korean salary
my fiancee also lives there. = I have an exploitable contact in NK
Unfortunately my car is in my parents’ name = my passport is obviously American
I plan to take those online while working in NH. = I’ll communicate via the SDMB
Wait, what? There is nothing resembling “good public transportation” in New Hampshire. Sure, if you are centered directly in a college town, with astronomical housing costs, or in one of the seacoast cities with some of the highest housing costs on the east coast you can go to a handful of surrounding towns/cities, but that’s about it. Most places in NH don’t even have buses. This is the state’s best bus service - count how many of the 260-odd towns/cities/townships that you can get to at all.
You’re 23, not 17. Do what you feel is best for your life. You have to own your decisions, even if your parents don’t agree. They’ll get over it, or not, that’s on them.
If you are a registered owner or are using the car with permission, you father can be charged with filing a false police report. A buddy got 2 years probation (and a police record to boot) for pulling the same stunt.
Huh, forgot about this post.
Actually took a trip up for about three weeks to get everything taken care of. Kept the parents happy and I’m still getting everything done. Once everything is settled I’ll be bringing my car back up with me.
Lmao.
Nope.
I’ll be very close to the MA border, and the Lowell MBTA line will be easily accessible.
I’m not a registered driver since my dad put it in his name to keep the insurance down. I have permission obviously, but no idea how the law works in TN.
If your name is not on the title, you may have to be willing to walk away from the car. Threatening to report it stolen is an asshole move, but it’s not worth dealing with the law over this.
This in spades.
One of the important lessons you’ll learn as an adult is that you can’t control what other adults do. As a child, your parents got to control you, and now they don’t. There will be an adjustment period for all of you.
Don’t try to win the argument on the terms they’ve presented, for two reasons. 1, the goal isn’t to win an argument, it’s to take responsibility for your life and hopefully minimize the hurt they feel. 2, the arguments they’re making aren’t the real issue. When they tell you that they paid for your school, they’re not really saying that you owe them that money. They’re saying that they love you and care for you and that it will hurt them when you move away. So what you tell them is that you love them and care for them too, and that it will hurt you too, but it’s what you need to do for your life.
Good luck
My parents, especially my mother, were equally adamant that I remain an eternal child and never move away from them (not out of love but control). The plan was, after I’d got the wheeze that was university out of my system, I’d go work as a receptionist in the mechanic’s garage owned by a friend of my dad’s. They oo’d and ah’d and tittered when I talked about my grad school applications (which I paid for myself with a work-study job).
No one except my brother actually believed I was going to go to grad school 2000+ miles away until he showed up with the small u-haul to help me get out there. My father threw one of his pissed off, ranting tantrums; my mother carried on as if I was being murdered in front of her. She accused me of betraying her, and actually told other family members that I had, in fact, died. Bit of a drama queen, that one.
Lesson learned: decades later when I moved to another continent, the first she heard about it was when I phoned her up the day after I got there. (I’d been living with her for the two years or so prior to the move, as she didn’t want to live alone after my dad died.)
My mother has also had trouble accepting the fact that I’m an adult. After I graduated college and got married I ended up living in our hometown because that’s where we found work. Almost a decade later when we started looking at moving out of state she had a fit. She started bad-mouthing my wife to her friends, complained she wouldn’t see our kids (she only saw them about once a month as it was) and a year after moving she still complains passive-aggressivly.
Kids grow up. Get over it. If parents have a problem with their kids moving away, it’s the parent’s problem.