What should I be paying?
The 600h will manage around 30mpg, emits just 199g/km but is still taxed hard. It also weighs in at insurance group 50 and just isn't going to be a £55 oil service, even with the best will in the world and using pattern parts from a Vauxhall Vectra. Don't expect it to be as kind on your wallet as it is to the pandas. The 460 isn't any better - expect mid-Twenties mpg.