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I would do each commute for 3 days (refueling at the end of the 3 day period) and then switch. If the route home is the biggest variable in the usage of the car by switching back and forth a few times and recording the mileage you will find that one is a clear winner in MPG or you will find that the results are inconclusive which means take which ever one you want.
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Learn from the mistakes of others, that way when you mess up you can do so in new and interesting ways.
One mile of road will take you one mile, one mile of runway can take you around the world.
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