67-75mpg, but they are not in production, and are very expensive to create. So the price for making it, outways the price of using water to power it.
More, if it is an electrically-powered limo...
about 25 to 40 km per gallon depends on the car or make
The 1998 Ford Expedition SUV gets 12 miles per gallon in the city, and 16 miles per gallon on the highway. This vehicle is powered by an 8-cylinder engine.
The E85 model of the Chevy Equinox gets between 14 and 19 miles per gallon. The gas-powered version of this car attains between 20 and 29 miles per gallon.
A gallon measures volume of water not distance.
20 miles to the gallon 20 miles to the gallon
15 miles to the gallon 15 miles to the gallon
18.5 miles a gallon
it can get 8 miles to the gallon
16.5 miles per gallon
52.27 miles per gallon
About 21.4 miles per gallon. (300/14 = 21.4)