Cheating the test

[Charon]

And here we have something new. https://www.yahoo.com/autos/epa-move...140312457.html

[Charon]

And more. Draigflag ought to love this one. Update: EPA says your racecar is probably already illegal

[Draigflag]

I dunno Charon, seems like you're fresh out of ideas, how exactly does this relate to anything I've said before? Or even the topic at all?

[OliverGT]

This is the best site that I can find on how car manufacturers manipulate the current EU testing cycle:

Mind the Gap! Why official car fuel economy figures don’t match up to reality | Transport & Environment

You can download the various PDF's that explain in quite some detail what they do.

This is just a sample...

Taping up gaps to improve aerodynamics.
Changing wheel alignment to improve rolling.
Pumping up tyres to improve rolling.
Disconnecting alternators to decrease load on the engine.

All of this is perfectly legitimate in the current tests, but does mean that you are very unlikely to be able to match the quoted figures in real life.

Oliver.

[Charon]

This time, Mercedes. And before I get accused (again) of seeking out these articles, I didn't. It popped up on my news feed. Mercedes Faces Lawsuit Over BlueTec Clean Diesel Emissions - Bloomberg Business

[Draigflag]

Well some of the Real World data is starting to be made available to the public following the future powertrain conference.

Interesting to see that tyres and brakes create about 3 times more particulate matter than a Euro 6 diesel engine.

VW did surprisingly well infact the worse culprit was actually Vauxhall who are American owned by GM. Interesting.

[Draigflag]

Peugeot and Citroen releasing some of thier real world data. This is based on C02/fuel economy, not mention of N0X here. Between 20-36% difference, quite a chunk!

[Draigflag]

PSA have released the next batch of "real World" figures, as expected, some of these figures come nowhere near the official MPG's achieved in the NEDC test cycle, further highlighting how flawed the test is.

[benlovesgoddess]

Yes, an 88 mpg claim proving to be 57 mpg at the pumps - what i'd expect.
Maybe my Hyundai was unlucky - i was furious when the car i bought on the back of a 94 mpg claim delivered 60 mpg.
The Prius has a mid 80s claim and a mid 60s reality. If i hadnt already had my eyes opened to the flawed economy reporting system then i may have been very cross with Toyota, ruining my enjoyment of a great car.
the i20 had other issues though - a problem with the engine itself that Hyundai are clueless about, and being very bland and not comfortable for any length of time.

[Draigflag]

Ben it's a reality for everyone, literally nobody gets the claimed MPG, or anywhere near them. Extreme hypermiling might get you close, or better as I did once or twice, but that's just not how people drive unless you're 104 and it's a Sunday!

I'm pleased they are compiling real World data, and I'm pleased they are changing the test next year.