[NVDave]

Propane or LNG are “fluffy” fuels - ie, the density of energy in the fuel tank is much lower than gasoline. Gasoline is “fluffier” than diesel fuel, and so on.

Compressed NG is even worse.

So it isn’t an issue with the mileage, per se, it is a factor of the fuel caloric density.

[Wonder Warthog]

"Propane or LNG are “fluffy” fuels - ie, the density of energy in the fuel tank is much lower than gasoline. Gasoline is “fluffier” than diesel fuel, and so on."

Cheez. Propane and LNG have been used in tractors forever, with zip problems. If the Dallas police had problems, it was probably due to crappy workmanship in the conversion. Cars have been running on propane for decades, with no problems (and in actual fact, due to the cleaner nature of the fuel, they last far longer).

[raybbr]

So it isn’t an issue with the mileage, per se, it is a factor of the fuel caloric density.

Pish tosh! What are the laws of physics compared to a politician?