The military uses a lot of CNG-converted vehicles when civilian vehicles are needed (all the things you think of as a military vehicle is diesel, but there's a

The military uses a lot of CNG-converted vehicles when civilian vehicles are needed (all the things you think of as a military vehicle is diesel, but there's a lot of little sedans and big vans for people who need to drive off-base for work). The government can get away with this because military bases are pretty much self-contained and you can put as many CNG fueling stations in as you want to. As I recall, though, the range between fill-ups is terrible compared to gasoline and once you got off base there was pretty much nowhere to fuel the things.