Go on then, name another diesel race car.
I can think of one, off the top of my head.....
Peugeot 908 (also in LeMans)
Ricardo-Judd engined LMP from a few years ago
Seat Leon (one of the most successful touring cars of modern times)
JCB Dieselmax (not a race car, but has the land speed record for a wheel driven vehicle)
I think there are a few more but those are the main ones!
May I congratulate you on a job well done then, because if the stats are close to the real world they are excellent.
Are certain manufacturers further from the stats than others then?
I'm not going to lie and say they are exactly the same as you have to make compromises to hit the CO2 target in the NEDC test zone - but they are as close as you are probably going to get. Volvo made a big deal about getting real world fuel economy good as in the home market they would get shredded if people replaced their current Volvos and didnt get at least the same or better fuel economy.
The NEDC test is defined around a set of coastdown terms which are notoriously simple to fudge. Some manufacturers fudge them a lot more than others. Unfortunately that is one area we don't have control over when we calibrate an engine and so have to go with what we are given. The Volvo ones were certainly realistic though - they are easily the most honest company I have worked with.