I drove 1800 miles in a Hydrogen Car

Great but 2 points to consider
1. So it forms H2O that means you have to consume half the number of oxygen from air to the number of hydrogen. So u r not just consuming hydrogen which is human generated but u are consuming and relieing on the oxygen from the air at that particular destination.
2. From where u genrate hydrogen. If you are generating by splitting water then u r doing worst then fossil fuel engines. So do u apply electricity to generate hydrogen again?