We all know what they claim and what you actually get can differ hugely. Of all the cars I have had the Nissan QQ was the most disappointing regarding the figures and was a 1.5 diesel..
I had the same one, the Mk2 QQ when it came out in 2014, 1.5 dCI Renault diesel, terrible MPG and gearbox, used to stall pulling out of junctions or move up to 2nd and find no power!!. In the end it was that bad I handed it back and got a 2l diesel Kuga.
Please excuse spelling/typos. Apart from being a clot it turns out I had one on my cerebellum that's now causing various problems!