A NEW TYPE OF HYBRID

Yes, Christopher, in theory it would be _possible_ to use a battery and motor to give extra power to a CNG-fuel-based car. But there are a few engineering details to work out.

For instance, where would you put the electric motor(s)? You could do like GM and put an electric motor in the belt-drive train with the alternator and air conditioning compressor. Or you could do like Honda and sandwich it between the internal combustion engine and the transmission. Or you could do like Toyota and use a planetary gear train to incorporate the electric motor's input into the transmission. Or you could put an electric motor in each of as many wheel hubs as you have money for. Or you could even have an electric-motor-driven wheel in the trunk or behind the vehicle that drops down to the road surface to provide motive power. (All of these have been tried / proposed.)

Then you have to decide whether to have a simple switch to turn on the electric motor(s) when you want to use them, or have a computer do it for you.

Then you have to decide whether you want to switch the electric motor(s) manually or by computer to become a generator to recharge the "battery" when you want to slow down by using regenerative braking.

Then you have to decide what kind of "battery" you want to use. How much extra battery weight do want your CNG car to carry? Do you want to use lead-acid or nickel-cadmium or lithium ion or dilithium cells or what?

How much money do you want to spend? And do you have the construction skills to do it yourself or pay somebody else to do it?