I have the Citroen C4 automatic petrol version. The gearbox can be operated in fully auto mode which it does tolerably well if a little harsh on the gearchanges at times, or in a manual-shift mode as a clutchless change. The manual mode is useful for shifting up early when driving gently to save fuel. However, the manual mode is maddening as the car takes over when you are not expecting it. For example, if you've shifted down into second in slow traffic, then start to accelerate away you might find the engine roaring like mad because it shifted itself into first gear, but doesn't want change up again. If the wretched thing wants to be called manual-mode, it should behave like it.
The reflections in the screen in bright sunshine can be dangerous. I have been in the situation where I couldn't see the nearside of the road through the reflection. The reflections are from the acre of plastic dash, in particular the central instrument console, exacerbated by the shallow slant angle of the windscreen The problem is not the colour of the plastic but its finish - it's too shiny. When I can find some black velvet, or similar, I shall stick it on all of the horizontal surface, the problem's so bad.
The suspension transmits far too much of the road surface at traffic speeds. At higher speeds, it all smooths out and is quite comfortable. My previous French cars were designed for rough French roads, but not this one, it seems.
Fuel consumption from the 1.6 litre engine (don't forget it's automatic) is about 36 -37 mpg about town, 41 mpg on long runs.
Rather wish I hadn't bought it now.