[John Galt's cousin]

In the mid to late 90’s, IIRC, the USPS, Brooklyn Union Gas and some other fleet operators had LNG / gasoline vehicles.

You could refill the LNG at the pump behind the post office! (If you had the special charge cards)

Seemed like a pretty good system at the time. I do not know if they still operate that way

It would be ideal if the LNG could be pipelined, but it may be too volitile for urban or suburban areas

[PapaBear3625]

In the mid to late 90’s, IIRC, the USPS, Brooklyn Union Gas and some other fleet operators had LNG / gasoline vehicles.

Availability of fueling stations has been the big issue. Truckers will not convert to LNG unless there are fueling facilities, and it makes no sense to install fueling facilities if there are no customers.

UPS has done something about it, setting up a corridor between California and Las Vegas

The new LNG-powered tractors will pull trailers on a transit lane linking Ontario, California, and Las Vegas, Nevada, along with UPS's 11 existing LNG tractors.

UPS plans to build publicly accessible LNG fuel stations in Las Vegas and will be able to access existing fuel stations in Ontario, California, and Salt Lake City, Utah, filling in an LNG trucking corridor that extends from California to Utah.

Installing LNG pumps at truck stops along I-95 every 200 miles would do a lot towards making LNG viable as a truck fuel, and would do a lot more for promoting energy independence than subsidizing the Chevy Volt.

[Le Chien Rouge]

Presently, UPS along with FEDex are converting their fleets of LOCAL delivery trucks from gasoline to natural gas.

From what I have read, both companies have secured long term price deals with natural gas providers in order to rid themselves from the wildly fluctuating gasoline prices. In the long run these deals will keep operating costs down.

This is how the free market works. Eventually other industries will do similar conversions fuel prices will eventually stabilize.

[Eric in the Ozarks]

Amoco had a CNG experiment in the Atlanta area in the 80s. It went nowhere.

[thackney]

the USPS, Brooklyn Union Gas and some other fleet operators had LNG / gasoline vehicles.

I suspect you mean either CNG or LPG, not LNG.

LNG required constant refrigeration down to -260°F or it constantly will boil off requiring venting (or keeping the engine running).

but it may be too volitile for urban or suburban areas

LNG or CNG is just natural gas, methane. LNG tends to be more pure methane because of they cryogenic freezing to make it liquid.

LPG is propane used for the BBQ.