Now the trick would be to make it stupidly expensive compared to what the parts are actually worth. I checked so 10.5/1 is possible and when coupled to some computer guided timing you get the 2nd benefit of hi-compression and a standard transmission, the car slows down when you let off on the throttle.
That also means all your garden toys should be able to be converted also and if the motor happens to be a 5hp Briggs then there is a ton of racing parts already available. A rechargeable 1lb bottle would do a big garden, un-scew the tank when not in use on that machine and plug in the next one.
Now if it could be made into a hydrate the explosion proof bottles wouldn't be needed. 50 bottles @ 1lb each might be better than 1 50lb tank as it has limited usages. A motor-home should carry a 'fat-boy' as it powers the engine and all the appliances including power generation and AC.
It would be better if the wells started collecting gas as that could be captured and burned and the water used for whatever purpose it is best for, sewage might be the only use so people could pump their sewage into the dried up wells and aquifers and they would become producers of methane based gasses. Good water would come from the rains and dew catching devices as they are passive and driven by the difference between the highs of the days and the lows of the nights. If the water can be used in the house then a bladder in the attic as being the first point it goes to after entering the place means any gas in the water will bubble out at the highest point so the taps and other places below that only get water that has lost all the gas that it contained. the 'chamber' might have to be kept at a certain pressure to let all the gas out. That would be free energy.
Ever notice that Piranha are shaped just like a frying pan?