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I drove the same 10mi length of expressway, in the same direction, twice today. Once at 4:00pm, when it was pretty warm out, and once at 10:00pm, when it was colder. The Insight behaved dramatically differently during the two trips.
In the afternoon, I easily did lean burn, holding my speed (64mph) up inclines, and having to ease off the throttle on level ground. In the evening, I held the throttle at the threshold of lean burn, and the car went 60-64mph on the flats, and slower up inclines. I had to break lean burn on a few uphills.
71.2mph in the afternoon, ~69mpg for the day.
Conclusion: in the same car, on the same road, on the same day, the amount of energy required to move down the road, and the amount of fuel consumed, was notably different at 4pm vs 10pm.
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