65 in my sorry state but 70 mph is normal around elsewhere for max speed limit.
As for regular travel speed, meaning what people normally drive.... You get anything from folks doing 10-15 mph under the limit to normally folks driving 10-15 mph over the limit, except for the big cities. There, they seem to drive 90 mph or greater. On my trip to Florida, Georgia was pretty calm as I've read on travel sites that they watch speed very closely. Most were driving 75 in 70 mph zones. But when I crossed into Florida, at times I was reaching close to 100 mph and still had people flying past me like I was standing still.
When I went to Florida, I drove through the West Virginia mountains on the highway. My sorry excuse of a vehicle, Mazda Tribute, couldn't even keep up the 70 mph limit on those hills. Not only that, but I was getting seasick from rocking back and forth. I think I drove for at least 2 hours or more without ever driving a straight section. The ride home was rougher as it was about 15 hours into the 19 hour trip with an extremely tired family.
You know, hoping a complete moron survived an utterly irresponsible and extremely dangerous act of pure stupidity is not rational. He'll now be a burden on society and his parents and he probably can't appreciate what they do for him because he's a vegetable.
I wouldn't do something like this, but if I did, I would make sure to get myself killed in the process.