Give it up, I'm not buying fuel any more
Since I got an EV (Nissan LEAF) and solar, I have totally got used to making my own fuel. I'm not about to go back to buying fuel just for increased range when I so rarely go near the limits of my current car and if I was to want to go further than that, there are plenty of charging stations around at regular intervals or the nice people down at Avis or wherever who will lend me a petrol car in return for some money.
Hydrogen is just another scheme by the fuel companies to keep us paying them to run our cars. Don't be taken in. Get a pure EV and either charge from the mains (you'll barely notice the increased power bill) or go the whole hog, get solar and charge for free.