Some of your attitudes to Autogas make it sound as if you are auditioning for the Harry Enfield character, the one who was "Considerably richer than yo!".

I can afford to run my 3 cars without having to consider the fuel costs because they all run on LPG. As a pensioner I am not in a position to increase my income so I chose to do it this way.
Admittedly I was able to convert my own cars so this helped the economics of it all. The cars all perform as well if not better than on petrol. Engines run cleaner both in an internal sense as well as environmentally.

As for the smell, well I had a diesel once and it was a miserable experience, not least because the stink of that stuff gets everywhere including your shoes as you paddle in the infernal stuff at the filling station. If you can smell the gas, then you have a leak and smell alerts you to that. Or you are deliberately sniffing it, which is not good but not unknown.