“From a component standpoint, we’re using the automotive technology, we’re simply replacing gasoline with propane,” he says.

Roush Clean Tech’s Rob Little says retrofitting a traditional fuel chassis takes approximately 8 hours and propane component installation follows their gasoline counterparts.

“Our fuel likes take the same exact symmetry as the existing lines,” he says. “Take off and put back on in the same spot.”

The secondary market is just now emerging, Little says, citing a strong used propane truck market in Mexico.

“They’re not spending $60,000 on a vehicle like this, but they’ll spend 10 or 20-grand for a vehicle with 200,000 miles on it.”

Typical payback on a propane conversion – which can be refueled at a rate of eight gallons per minute – is 18-24 months on 20,000 miles per year, which do not include federal incentives and tax breaks on purchases of green vehicles.

Jason Cannon is online managing editor for Truck Parts & Service and Successful Dealer magazines, sister publications to Better Roads.