The headline figures for Vauxhall’s completely new 1.6-litre diesel engine that makes its first appearance in the Zafira Tourer are seriously impressive – doubly so when you consider that this is a full-size seven-seater.

For starters, the CO2 stands at 109g/km while the official fuel figure is 68.9mpg, numbers that help to put the Zafira Tourer, which remains unchanged in all other ways, in the same 16% benefit-in-kind band as the Renault Grand Scenic 1.5 dCi, the class leader for diesel efficiency. However, the Zafira is significantly, and usefully, better on performance. While most rival engines offer no better than 120hp, the 1.6-litre CDTi diesel produces 136hp, which means 0-60mph comes up in 10.4 seconds with a 125mph top speed. The new engine also shows significant improvements in noise reduction.

So at this point you’re thinking there’s got to be a catch. And you’d be right: the price is £1100 more than the 130hp 2.0-litre diesel that is already offered (and will continue to be offered) in the Zafira Tourer. However, this premium is more than offset by the fuel-saving alone (over 60,000 miles) as the 1.6 is 24% more efficient than the 134g/km 2.0. And for fleets there are significant savings on tax too.

What, then, seems odd is that Vauxhall believes the 130hp 2.0-litre diesel will remain the best-seller in the range, although you can’t help thinking this prediction will change as soon as they see orders come in for the very efficient 1.6 CDTi, which not only is the best engine in the line-up but also makes the Zafira Tourer a winner over rival seven-seat MPVs.

Vauxhall Zafira Tourer Tech Line 1.6 CDTi ecoFlex
P11D price £23,120
Model price range £21,370-£29,190
Residual value 29.5%
Depreciation £16,295
Fuel £5612
Service, Maintenance and repair £2174
Vehicle Excise Duty £40
National Insurance £1659
Cost per mile 52.5p
Fuel consumption 68.9mpg
CO2 (tax) 109g/km (16%)
BIK 20/40% per month £61/£123
Service interval 20,000mls
Insurance (1-50) group 16A
Warranty 3yrs/ 60,000mls
Boot space min/max 152/1860 litres
Engine size/power 1598cc/136hp
Top speed/0-60mph 125mph/10.4secs