Ray makes a very valid point about the old CNG.
For some wierd reason, it was never available in the South Island.
Maybe it was piped to it's filling stations.
But one thing I do remember was the number of North Islanders that came down here in the 1980's that ran out of CNG at either Kaikoura or between there and Christchurch, only to find that it wasn't a nation-wide thing.
Anyone with a bent for automobiles would remember the Sherpa, we had them at Sullivan & Spillane Electrical in Temuka.
They were a Dual fuel setup and going from LPG to Petrol was often a bumpy ride.
I preferred the comfort of the Ford Prefect Panel van that the Senior Electrician had.
It ran on REAL fuel. [Linked Image]