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Propane isn't as desirable in a fogging style bifuel as it's auto ignition temperature is lower than that of natural gas. And gasoline is even lower. now, a spark ignition engine can use all three since sparks are pretty high temperature ignition sources.

CNG is the buzz word in stretching diesel supplies, only thing is the range is highly limited. Diesel is dense and requires gossamer thin tanks to safely store. Beware of those pitching buzz words, that is the hallmark of a politician in need of retirement.

This thread is far more complex than spark ignition engine modification to natural gas, it is bi-fueled diesel. This is more efficient than spark ignition because of thermodynamics, Diesel engines have higher compression ratio and lower pumping losses. Yes, it could be done but the cost is too...

For stationary applications, you don't need to compress the natural gas, making it far more economical than compressed. This is what makes CNG expensive.

What CDR is talking about is hybrid diesel and natural gas. How it works is simple, natural gas is mixed with the intake air at concentrations less than the lower flammable limit, the small amount of diesel needed to induce combustion then burns the natural gas, releasing the heat equivalent to...