Today's Budget speech by the UK Chancellor of the Exchequer held some mildly good news for Prius owners in Britain. Its 104gm/Km CO2 production rate has earned it a reduction in annual Road Tax (tax charge on vehicles used on public roads) from GBP75/year to GBP40/year.
Naturally, this won't make a huge difference; but it's a step in the right direction. All CO2 figures are the "official" ones.
Cars producing 100gm/Km or less now fall into a new No-Tax band, whereas the worst gas guzzlers (I have no CO2 figures) get a new category costing GBP210/year.
FWIW, figures are available on the