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I think what he is saying is that per gallon each person gets 20miles but since they are all using the same gallon it is 20(7)=140 where as if they each were driving separate cars at 20miles a gallon then they would be using different gallons so it is 20(1)=20. All it means is that if fewer vehicles are used to move the same number of people then the vehicles MPG wont matter so much because it will be more efficient than all those people taking there own vehicles.
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