[thackney]

Do you understand how the electronic diesel injector works, it still is a pressure system, it just uses an electrical switch to open the injector. So how do you compress the gas and the diesel and control the mix.

You talk like this is some theory. Diesel engine manufacturer have offered dual fuel systems with Natural Gas for decades. I have participated in the engineering/construction/startup of these in remote locations for the past two decades for oil/gas industry.

One example of some bigger dual fuel engines:
http://www.wartsila.com/en/power-plants/power-generation/dual-fuel-power-plants

[org.whodat]

Yes and if you read it it says gasoline engine.