Great article Rob!
My longest driving day ever, in time spent and likely in miles, was probably the 800 miles at 50mph, Iowa to Pennsylvania, on my way from Stanford to Boston, in my 9 year old '62 Falcon, that had hit 100k in Lovelock, Nevada, and had the kind of power where you floor it and it feels like another person started pushing. I think I stopped about three times that day, for gas, food, and bathroom each time.
A bit later that summer, I was driving in France, and I was amazed at how--because of the traffic and the French driving--it took three hours for the back of my shirt to soak through--something that didn't even begin to happen crossing the country in 1971, when the US population was probably less than 2/3 what it is now.