I find the comments about high inefficiency interesting. I can't help but think that Porsche and Audi always look so healthy because VW is carry all the costs.. though given they ownership structures I guess that would be an arse about face way of doing it.
To be fair to Porsche and Audi, they both operate in much more profitable sectors of the market. Making cars is proportionally more expensive when cars are cheap, and you have to sell a lot more of them to make the numbers work.
A VW Up costs little less than a Golf to make - it's about three quarters the weight of a Golf, which in simplified terms means it uses three quarters of the materials, and takes broadly as long to make (for simplicity's sake, 100% of the labour costs of a Golf), yet VW has to sell it for half the price because of its market class.
Whereas Audi gets to enjoy the economies of scale of something like the MQB platform - even if it co-develops the platform and the engines, its costs are shared by VW, Seat, Skoda etc - but it can instantly bung £3k on the price of an A3 compared to the equivalent Golf. That £3k is, to all intents and purposes, pure profit.
Porsche does a similar thing. A Cayenne or a Macan isn't massively expensive to make in the greater scheme of things - a few nicer materials here and there, a largely bespoke engine rather than a VW parts bin thing now and then - but it can sell them for nice healthy price tags. And of course, offer a long and expensive list of options that add very little to the bottom line for Porsche but can see the customer paying ten or twenty grand extra... and you can see where they make their profits.
I think the mention of "inefficiency", and the following comment about slashing R&D budgets, more likely suggests that VW wasn't really breaking the mould with anything it was developing. Beyond some electronics here and making an engine incrementally more powerful and fuel-efficient there, when was the last time they came up with something game-changing? I like the XL1 for example, but an aerodynamic diesel hybrid is hardly an earth-shattering concept...
Just stop diesels and pump your R&D into reducing petrol CO2 even further. It's already pretty impressive compared to where it was ten years ago and the NOx levels are much more suitable.
The way modern turbo petrols are being geared is not too dissimilar to a turbo diesel in mid-range urge on family car engines anyway.
Much as I'd prefer to see (and smell) petrol cars to diesel ones, turbocharged diesels do still have much greater real-world efficiency than turbocharged petrols. Few cars meet their official consumption figures, but some of the current petrols are chronically bad at doing so, whereas diesels merely miss the mark.
Better are the naturally-aspirated petrols found in small, light cars. Any of the three-cylinder city cars on the market right now - VW Up, Toyota Aygo, Smart Fortwo, Hyundai i10 etc - will get a fairly easy 60mpg in regular driving. No, they're not particularly quick, but they're proof that a the simple formula of a small engine in a lightweight car works.
Personally - and I know this is unlikely to happen - I'd like to see how far VW could advance electric vehicles, if they plugged the same sort of money into those as they have into diesels over the last few decades.