Comment Re:Misunderstanding? (Score 2, Informative) 146
You're allowed to spend a gallon per passenger for every 200 miles traveled. So if you have 10 passengers you can spend 10 gallons to go 200 miles.
10(passengers)*200(miles)/10(gallons)=200 Passenger Miles/Gallon.
10(passengers)*400(miles)/20(gallons)=200 Passenger Miles/Gallon.
And so on.