It is much more interesting to compare the real life mpgs.
From Honest John's RealMPG website
http://www.honestjohn.co.uk/realmpg/:
1. Citroen C4 Cactus 1.6 BlueHDi:
62.3 mpg
2. Renault Captur 1.5 dCi:
56.7 mpg
3. Peugeot 2008 1.6 BlueHDi:
61.8 mpg
4. Nissan Qashqai 1.5 dCi:
53.4 mpg
5. Renault Kadjar 1.5 dCi:
58.9 mpg
6. Vauxhall Mokka X 1.6 CDTi: xxx mpg
7. Nissan Juke 1.5 dCi:
49.6 mpg
8. Suzuki Vitara 1.6 DDiS:
59.9 mpg
9. Mazda CX-3 1.5d:
57.1 mpg
10. Honda HR-V 1.6 i-DTEC:
57.6 mpg
It's generally quite close and the Cactus still tops the list but the Nissans drop to the bottom of the list.