Actually, at times we were going 90mph.
That part of I25 has an elevation of about 5,500 feet. I need to hypermile it in August, because my fuel econimy was better than expected. I'll cover mountain driving in another thread, but airliners cruise at 30,000 feet to increase their FE. Case in point: the second airliner that impacted the World Trade Center was going in excess of 550 miles per hour. At sea level, the air density almost caused the 767 to break up before it impacted.
I did feel a bit silly in this Insight vs. Prius race as we are both in the brotherhood of hybrids. It's kind of like the IMA vs. HSD debate.
