LPG rental Falcon?

[Brazen]

In Adelaide the other day sitting in my rental Falcon in traffic behind what I thought was another rental Falcon. It had NSW plates, sparkling clean, and the usual barcodes on the rear and side windows. What caught my attention was that it had a LPG sticker on the number plate.

Now a LPG rental Falcon for me would be fantastic, its not uncommon for me to mega kays in rental cars. So do LPG rental cars exist? I have googled searched it but cant find anything. Im actually starting to think I might have imagined it.