I'm never in a hurry, 65 gets me there every time and drives my passengers nuts every time I get passed. I also never get asked to take the wheel for a while when it is not my vehicle and have plenty of volunteers to spell me for a while.
Interesting. I'll roll at 82-83 in an 80mph zone and will make up 5 hours during a round trip to the Salmon on you.
Granted - we're not comparing apples to apples since you can't AVERAGE 83mph the whole way but still - the difference between keeping the vehicle at or below 65 and closer to the speed limit is actually a difference of many hours over the trip.
I digress - but it should be noted that most hwy accidents come from DIFFERENTIAL in speed not overall excesss or low speed travel.