If you live within 10km of the CBD and like commuting in traffic jams, buy a Prius.
If you live within 100km of the smog and see a lot of highways, run a V8 on LPG.
If you live 500-1000km from the big smoke, buy a turbo diesel and you can even clean it up with LPG enhancement.
Horses for courses, tools for the job etc
