Over 80mph is considered a "wreckless endangerment" felony in VA. Along I-95 the speed limit is 70mph from the southern border up until close to Richmond. Set your cruise control for 75 and your should be OK. Once your in NoVA near DC, just keep pace with traffic and you'll be fine. Note: DC Metro drivers can't drive - be careful.
Sauce: I drive from MD to NC along 95 twice a month and never been ticketed.
P.S. Just north of Richmond in a place called Ashland is an excellent gun shop called Green Top - right off the exit. Well worth the visit.
I guess "it's happening" is actually finally happening.