Though there,s no word on the size of the tank, a single fill-up can take you an impressive distance-with a cruising air speed of 107 miles per hour, it can travel almost 500 miles before having to set down to refuel. On the road it can reach a surprisingly 70 miles per hour, though its, range in unknown. It's presumably much less efficient while earthbound,and Terrafugia itself says that it foresees the Transition spending no more than 15% of its time in that mode.