I was confusing it with LPG. The huge majority of buses and taxis around here run on it, which is a big percentage of traffic on the road. A decade ago it was 1

I was confusing it with LPG. The huge majority of buses and taxis around here run on it, which is a big percentage of traffic on the road. A decade ago it was 100%, now most new replacements are electric but it will take at least another decade until the existing LPG fleets are entirely replaced.