Larry Moulthroup of Proton Energy Systems in Connecticut, which lent me my fuel-cell Toyota Highlander, offers some thoughts on how the water car might work.

FORBES: Cars That Run On Air And Water

These include the coming Lexus RX330 and Toyota Highlander from Toyota, the Acura MDX and Honda Pilot from Honda, and the Infiniti FX35 and Nissan Murano from Nissan.

FORBES: Vehicles Feature

These include the family friendly Toyota Highlander crossover SUV, the budget-minded Yaris subcompact and the fuel-sipping Prius hybrid hatchback, along with the upscale Lexus ES 350 sedan and RX 350 crossover.

FORBES: The Most-Reliable Used Cars