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I honestly don't think that they're the only ones, it's ridiculous to claim that all the other manufacturers can achieve similar emissions and efficiency figures, yet VWAG are the only ones cheating...
I also thought it's a well known thing (not officially, of course) that pretty much all modern ECUs are programmed so that they present the most efficient figures in test conditions. After all, the DVLA emissions test (for example) is probably well known to the manufacturers, so they can program their cars to behave as well as possible in those particular conditions - which often has little bearing on real life usage.
From my relatively limited knowledge, what do you think happens when you remap an ECU? Those artificial restrictions are removed, and your engine is reprogrammed to work to a higher, more uniform performance. Fuel efficiency often increases, but pollution is an entirely different consideration (they also tend to feel much nicer to drive).
Now, if VW simply use a profile that presents semi-artificial figures in a certain set of situations, then this could be argued to be fine. However if their software actually monitors for certain conditions and then adjusts its parameters, that's far less of a grey area in my view, and is more of a problem. I realise that for the environment this makes no difference, but it's down to technicalities...
I'm also not convinced by the argument that petrol engines are almost as efficient as diesel engines; I get around 45-50mpg on my barge of a Citroen C5; I don't drive slow but I'm not too zealous either, but for a big car that seems pretty darn good to me! I very much doubt I'll get more than 35mpg with an equivalent petrol engine, and I don't think the maintenance costs will be that different. So yes, particulates and NOx are an issue, but aside from that why would I seriously consider a petrol engine for a car of this size or larger? |
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