[CNGBiFuel]

I've seen far more lash-ups than any decent installs, I've just inherited one of them, a real mess. LPG and the buyers that wanted cheap conversions dug a grave. Not withstanding that the garage-trade could find ways to blame any fault on the LPG install.
When good it's brilliant. LPG done right is what took me onto CNG, that was years back. But it's less of an instant-fix, thus not for all. EV is, and is seen as cool etc etc.

Rightly or wrongly, the EV crowd are going to win this one, in fact it looks like they have. As the pile of EV cars with battery cost at more than the residual-value builds-up, and it's set to be the next diesel scandal.