Both of the engines have been developed in conjunction with BMW and offer greener solutions to the units they replace without any compromise in performance. The 118bhp VTi returns 42mpg over a combined cycle, an increase of six per cent, while CO2 output is cut to 159g/km from 169g/km.
The 148bhp engine does even better, with a 10 per cent increase in fuel economy to 41mpg on a combined cycle and a reduction of emissions to 164g/km.
Other modifications to the engine range include a revised 2.0-litre HDi oil-burner, which now complies with Euro 5 standards. All of the diesel engines in the C4 have improved fuel economy and the HDi 92 and HDi 110 have dropped below the 120g/km emissions mark with outputs of 117/gkm and 118g/km respectively.
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