The buses here in Nashua, NH run on natural gas.
It seems logical that any type of delivery vehicle that returns at the end of each shift to a warehouse could be better off using Natural Gas.
Meaning UPS, the US post office jeeps, Amazon vans, etc. Instead of stupid battery operated electric buses.
We have so much NG sitting in the ground all over the USA that we never would need to import petroleum. I also suspect burning methane instead of gasoline or diesel is less polluting.
FYI, I understand that we import heavy sulfur petroleum and then turn around and export gasoline or diesel fuel.
Before wider use of diesel engines in the 60s, a lot of big trucks ran on LP gas. The same with farm tractors.