I've tried going up the 6% grade west of Denver on I70 recently on a 5-speed Insight. I could do 60-65mph, but was in 3rd almost red-lining to avoid recalibrating. Fortunately, that kind of terrain is rare.

61.5mpg lifetime - 82mpg in recent months

Best Run >
www.cleanmpg.com

"fanatic" is what the lazy call the dedicated