There seems to be a lot of concern lately about highway cruising speed. Please remember that during the early to mid eighties when these cars were built, the U.S. had a 55mph national speed limit that didn't look like it would ever get raised. Try cruising at 55, as these cars were designed, and I think you might be surprised. This is not to say that they won't go faster, because they will. But 55 - 60 should be the sweet spot.

__________________
Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
Chain Elongation References