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I figured since he started by discussing the 50 mph speed limit and a 5 mile commute, he would be consistent, so the 80 refers to 80 mph. The other thing is it's no problem to accelerate to 50 mph and coast back down to a stop in 1.5-2 miles. It's not so easy accelerating to 80 and coasting back down within 1.5 miles. Agreed, he could have switched between mph and kph, though.
For a 5 mile drive, I'd bicycle. If I drove it, I'd conserve momentum, and try to reach each stop rolling less than 10 mph if driving a manual, and <20 mph if driving an automatic.
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Darrell
Boycotting Exxon since 1989, BP since 2010
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac? George Carlin
Mean Green Toaster Machine
49.5 mpg avg over 53,000 miles. 176% of '08 EPA
Best flat drive 94.5 mpg for 10.1 mi
Longest tank 1033 km (642 mi) on 10.56 gal = 60.8 mpg
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