If I were to be one of such prospects, I’d aim at a pay-back period of < 18-months, provided I intended to keep the car for atleast the next 36-months.

LNG – Advantages and Pitfalls

Any Gas becomes a ‘Liquid’ when ‘super-cooled’ and CNG is no exception. It turns into liquid at temperatures of about (–) 260° F. LNG thus naturally has a higher ‘storage density’ than CNG. When used as a motor fuel, LNG is stored at its ‘boiling point’ as above on-board the Vehicle - as a saturated liquid. The Tank pressure determines the actual fuel temperature.

A typical storage pressure of LNG is 50 pounds per square inch ‘gallon’ (psig) at which the fuel temperature is (–) 220° F. In this state, LNG has an energy density of approximately 230 % of CNG at 3,000 psig, and about 55 percent of diesel fuel.