One way into work.
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5 miles at 40 mph, 5.9 miles/kilowatt = .84 used
5 miles at 50 mph, 4.6 miles/kilowatt = 1.08 used
16 miles at 65 mph, 3.6 miles/kilowatt = 4.44 used
Totaling 6.37 kilowatts.
Then turn around and come home same route so 12.74 watts total for the day...