It is very hard to find the actual truth as on the owner forums one reads pages of complaints and hybrid versions but much less about the mild hybrid ie versions without the motive element of hybrid, my mild hybrid Arkana only does coasting and that is it.
The mild hybrid is substantially quicker in accelerating, weighs 100 kgs less but it does 10 mpg less. But then much of the complaints of the full hybrid are not about the drive train but other areas of electronics oddly. We have the full hybrid in the Clio etech we have which is very pleasant to drive with the electric motors, yes two of them, adding quite a shove at low revs where the naturally aspirated 1.6 engine would not have the torque. In the mass produced Clio the etech works very well. MPG is in the upper 50s and my lad drives it with no real thought about being economical. Renault have decided to bring back the little 1 litre engined module after dropping it because Ford have stopped selling the Fiesta.
The car market is quite screwy really. One reason I bought the Arkana mild hybrid is that I have a petrol fuel card but company will not provide an Allstar EV charging card so I am better off using a fuel card, effectively paying 30p a litre for fuel and this keeps me having a petrol car This will finally change when we get the Salary sacrifice system going and I can get a model 3 for sub £40k and 3 hundred and something pounds monthly payments.
Hybrid, the full type. also lose quite a lot of boot space ie nearly 100 litres, in the case of the Clio, which is nearly quarter of the boot space. Zoe has more boot space than the Clio ETECH.
Can get 80 mpg out of the Clio ETECH but one has to hypermile the hell out of it to do so. With petrol at about £1.40 a litre not much incentive to be frugal.
Choice of car is more complex that most people might think. Best not to under estimate the massive attraction of salary sacrifice on EVs and this is why, I think, we see a lot for EVs and hybrids than once might expect ie UK government tax breaks via salary sacrifice and the taxation rules around CO2. The CO2 one is not well targeted in my view as CO2 figures for PHEVs are just crazy low numbers and not at all close to reality ie 100 and 200 mpg. Nonsense.