According to the RACV history page, "Geminis were introduced into the fleet because they were fuel efficient and more suitable for city driving." A single sentence.. but sums it up fairly accurately I imagine!
TD model it followed..
There was one more facelift (or model code change at the least) to the TG Gemini, before the switch to the new generation front-drive car in in 1985.
Likely not particularly surprising; but as with any old service cars (Police, ambulance, branded trucks/vans/etc).. I'd totally drive this as-is. Stoked to see this one still around too (supposedly it was on loan from RACV?) and in such great condition.
Cool display at a great museum.