Have a look to some Eurostile (Extended)/Microgramma.

I already have. It's similar, but it's not any of them...

Thanks

Sorry, I hadn't read your comment under the samples. Right, this is not Eurostile but this is really too close to be a coincidence. Actually, most of digits and letterings for the car industry are custom. So may be it would be not so hazardous to conclude it's custom and, to me, based on Eurostile Extended Black mainly reworking counters connections.

I have just discovered that Audi uses the same font for their dials.

http://www.lockwoodinternational.co.uk/images/c553_audi_rs5_kmh.jpg

So, I suppose it's not that custom.

I have just discovered that Audi uses the same font for their dials.

Sorry but they don't look the same to me. You could easily see the differences comparing /6 counter of Alfa Romeo 4C (your second sample) and Audi RS5 one. Audi RS5's is rounder than Alfa's. But you're kind of right because as you perfectly said form the beginning, they're all very close to Eurostile Extended without definitely being it. I'm also pretty convinced you'll get no "better" answer than "custom/proprietary typeface(s)" (in the same vein as Eurostile Extended/Microgramma to me).
More credit for the "Eurostile Extended" track: Alfa Romeo 4c website is using it everywhere...

Alternatives: Miedinger, Stereo Gothic, Kursk 105/205, Bitsumishi, Armchair Modern, QType FF, some Masterfont are using a slightly modified version of Eurostile Extended as latin counterpart (Propaganda...), Micro Extend (Casady & Greene version of Eurostile Extended/Microgramma), Quadrat Grotesk New, Brewmaster Modern, From The Stars, House Gothic 23 Extended, Metro DF
Related discussions with more alternatives for these digits: Max Bill clock face design for Junghans