Automakers do pump the fuel economy figures, but are they cheating on diesel? image

We all know real world driving has nothing to do with the fuel economy measurements outlined by the carmakers, thus emissions are also respectively higher, but reports are not decisive whether other carmakers took the illegal road just like VW AG.

Following the massive crisis engulfing Germany’s Volkswagen Group, which was caught cheating on emissions tests performed on diesel cars in the US, intense scrutiny has fallen over the technology, with various reports quickly jumping to conclude other carmakers might have cheated as well. But while many studies show that numerous cars emit more pollution during real-life conditions, experts warn that’s not really a problem and doesn’t point towards illegal behavior. According to Nick Molden, chief executive officer of UK laboratory Emissions Analytics, “no one has any hard evidence of anyone doing anything clearly illegal.” The issue comes from the set conditions – governments use tightly controlled lab conditions that fail to acknowledge how vehicles are actually driven in real world conditions. For example the European regulatory approval will not challenge the vehicle with aggressive acceleration, uphill road climbs or cold weather conditions. “You’ve got a very gentle test cycle with a lot of loopholes in it,” added Molden.

In real life situations, most diesel vehicles will emit almost no NOx (the particulate at the heart of the VW dieselgate scandal) – but only when the engine and emissions system are working at optimal temperature and the car is on a flat, smooth highway. But jump to aggressive acceleration, which can be found in almost any takeover maneuver, and the emissions will jump briefly to up to 20 times the allowed limit.