when we multiply the 747-8's figure of 0.142 miles per gallon by its capacity, for this purpose, of 410 guests, we get a much healthier figure of 58.22 passenger miles per gallon. Of course, a full five-seater car would only need to achieve around 11.65 miles per gallon to get a higher passenger miles per gallon figure, but, in reality, cars often only transport their driver.