Sounds like the laws of physics dictates that 70 to 80 mph is possible. Especially going down a long hill in neutral. On the other hand, running these tough engines at 65, although not desired, sounds do-able. I'm hoping atleast 60 mph will not be to much regular burden. Think I could live with that for casual driving. I use my Honda Accord to run expressway everyday in Atlanta where you'll need to go 90 mph and then sit in traffic rest of trip.
