Not being an expert, I am just happy to see companies like UPS experimenting with alternate sources for fuel. I know that propane like CNG has less BTUs than gasoline, but if a company like UPS can achieve any savings, it could lower shipping costs. An added benefit could possibly be a future reduction of diesel and gasoline use nationwide, which could lead to lower prices. An added benefit is’ A private company is doing the experiment, not the Federals doing it on our dime.
In our town in California the UPS trucks are almost all electric now. You can’t hear them coming anymore. ;(