Realistically, what you are getting is as good as it gets. The current crop of super low CO2 and super high mpg are pie in the sky, achieved only in self-certification test conditions in perfect temperatures on a low rolling resistance chassis dynamometer. Honda is more honest, even though this meant it could not certify the Jazz I-Shift at the promised tax-friendly 119g/km. The forthcoming 100,000 kilometre ‘in service’ figures will be more realistic.