Mathematically, all they need to do is add one electric car to the fleet.
Hey boss we have five models and they get MPGs of 22, 24, 26, 28 and 30
So our fleet average is 22+24+26+28+30 / 5 = 26 mpg, and we are illegal, what to do?
Just add an electric model, which by definition gets infinity miles per gallon.
Now the fleet has MPGs of 22, 24, 26, 28, 30 and infinity.
The average fleet MPG is now 22+24+26+28+30+infinity / 6 = infinity mpg.
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