Perhaps I don&#x27;t understand the measure (entirely possible!) but I think thrust-specific fuel consumption is a better indicator here.  You need to account for the thrust required in these behemoths:  replace the gas turbine engines with piston engines large enough to produce equivalent thrust and I doubt you&#x27;ll retain the fuel economy.<p>Either way, this is an auxiliary point:  the per-passenger fuel economy of airplanes is significantly higher than that of cars.