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Crunching your numbers, she saved 0.87 hours by driving faster, but you saved $7.38 by driving slower. Would you be willing to spend $8.48/hr to be at home instead of sitting in a car?
But if you had taken a car that uses half as much fuel as the Caravan, you would have saved $4.24/hr. To me, that's clearly a poor optimization, especially when there's two people in the car. Drive faster; you'll get there sooner.
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