[Sherman Logan]

$1.50 p/g versus 3.50 p/g - sounds like a no brainer.

Not quite that simple.

Propane = 90,000 btu/g, gasoline = 125,000 btu/g. Or thereabouts.

Whether that ratio holds for mpg, I have no idea.

[RetiredTexasVet]

Wow, that sounds really good. Maybe we should try ethanol, 100% ethanol or 100% propane .... I wonder why airplanes and large semis that have heavy loads or travel up mountainous roads don’t use 100% ethanol or propane, it’s so much cheaper.

[jjotto]

Yes, that’s physics.

And it’s more complicated than that. Vehicle range is only one-half of similar conventional vehicle, and it will be one of the slowest vehicles on the road.

A Honda Civic generally sells for around $20k. Make that a CNG Civic and the typical price goes to $27k or more.