HEY, I know I've been blunt, pissy, and perhaps, even condescending(which was wrong, I apologize for doing that) but I wish you the best in achieving your goals.
Yeah, you are inexperienced as a backpacker, TOTALLY untested in consistent higher miles per day with LONG distance backpacking, and IMHO grossly naive about some things but you also display a lot of maturity and a willingness to SOME DEGREE to consider things that you weren't aware of. You DEFINITELY already have some things going for you to achieve a 30 MPD avg. I'm still not sure you are ready for that though; take that from someone who has and is capable of doing 30 MPDs back to back to back but RARELY CHOOSES TO. Even though I thrued the AT before and can do a few 30's in a row I would find it hard for myself to avg 30's over a 2.5 month period or wouldn't be happy even if I was able to pull it off. It would change WHY I thru-hike to something that becomes negative FOR ME. That's what I was hoping for you to grasp when I spoke about Skurka or Pharr Davis. THEIR motivations, why they hike long distances or do speedy hikes, plays into their ability to accomplish those goals. What motivates you to want to thru the AT in 2.5 months? average 30 miles per day? What you aren't aware, because they didn't say it, is that a couple of posters on this thread have done 30 mile days and gave you SOLID advice on how to proceed accomplishing it yourself which seems like you ignored despite you saying otherwise. What's most important is what you believe and are ready for though!
Don't reaggrevate any pre-existing injury if you attempt the 2.5 month thru while avg 30 MPD. I'll say it again, you got a shot at it. UNLIKELY THOUGH. Never said it was an impossibility FOR YOU! HOWEVER, you now know, the VAST MAJORITY, who do 30 MPD have worked up to it not done it out of the box as raw inexperienced untested backpackers. Don't be naive about this. Doing it consistently, to attain an AVERAGE of 30 a day, takes it to an even HIGHER level. Don't be naive about this either.
I REALLY like the suggestions of other posters who said try averaging 30 MPD on a shorter distance hike first. You'll gain new perspectives of what it will take to avg 30 MPD on LONG distance hikes. Doing this will do all sorts of potentially positive things for you too that I'll let you find out for yourself.
You are in Edison. Not hard taking public transportation from there to the AT to Delaware Water Gap, various places in NY(one poster already gave some ideas, Pawling NY, Vernon NJ, Harriman SP, etc). Do a shorter section hike first say with the goal of avg 25 MPD. Do another short hike avg your goal of 30 MPD. Do the shorter Long Trail in Vermont as Mags suggested(that's a nice trail, nice helpful people). Before dismissing that idea answer these questions for yourself - why am I in such a hurry?, can I just enjoy a 2200 miles AT thru-hike? should I be approaching long distance backpacking as a competition or a race against time as is the case with competitive organized cross country running? am I making things more complicated than they need to be? My goodness. FIRST, before starting ALL the planning and expending ALL the time, money, resources, etc that entails a supported 30 MPD avg 2200 mile thru-hike answer the question for yourself IF backpacking even appeals to you! What if you gather all this thru-hiking info and do all this thru-hike planning for a 2.5 month thru-hike and at the end of the first wk arrive at the opinion backpacking sucks? Did you start out as a cross country runner out of the womb? NO. You worked up to it.
Take my suggestion to focus your questions in the future in such a way that elicits more targeted answers(that support the attainment of your goal). You started that with one of your concerns with your knee and knee pain inquiry and then let yourself get side tracked. Try not to let your thread go off on tangents which quickly happened here. Assimilate one answer first before proceeding to your next question(lock it in); you can facilitate this by starting more than one thread with one or two more targeted questions at a time. When you are just learning something helps to chunk info(opinions) down into smaller bites.
Hope to see you on the trail HAPPILY averaging 30 MPD doing it without hurting yourself determining what is right FOR YOU. All my best DDubs.
Oh, you get self satisfaction out of hard work? Good. Like the outdoors? Good. Me too. Want a job on my next landscape installation project in NJ?