The two ICCT studies you reference are studies of diesel cars. Your original statement said ALL the ICE cars [pollute far more on the road than in testing]. I hope you realize that petrol cars are also ICE.SageBrush wrote:arnis wrote:Reference ? Or are you perhaps referring to gas (petrol) direct injection engines ?
In any case, until ALL models are tested your statement is an over reach.
And that is mostly done.
http://www.theicct.org/real-world-exhau ... iesel-cars
http://www.theicct.org/news/press-relea ... even-times
It all boils down to the promise how fuel efficient the vehicle is and that it gets worse as vehicles get older.
All pollution data is taken from those lab tests mostly.
As we all know lab tests are not real world tests. As vehicles usually consume much more than promised
the also give as much more pollution as promised.
The story of VW in the dirty diesel world stands out for two reasons (besides fraud):
1. Diesel is dirty, but VW diesel is filthy.
2. The fraud was not perpetrated to pass EPA (as the other diesel models demonstrate,) but because ongoing use of the pollution control devices in VW vehicles would lead to high failure rates of those devices and warranty costs. It is amusing (and not a little sad) that even in the VW forums only a handful of people* understand the real issue that caused diesel to be a failure for VW and extend to diesel in general: reliable, inexpensive and effective pollution control of diesel combustion has not been invented. VW tried to continue business with 0.5 of 3 aspects solved while the other manufacturers are at 1.5 of 3.
*the large majority are mired in conspiracy theories that the EPA is "out to get them."
[/quote]You live in a world divorced from reality. Real world MPG spans the range of +/- 20% of EPA for 95% of cars on the road today. VW pollution is 25x the maximum EPA allowed. A Prius emits ~ 4% of allowable EPA NOx and all the SULEV rated cars emit ~ 30% or less of allowable EPA.As vehicles usually consume much more than promised the[y] also give as much more pollution as promised.
Are you following the arithmetic ? It would take 625** Prius to match the NOx emissions of One VW TDI. "Real World" MPG of the Prius is ~ 48 MPG as self-reported on aggregation websites. That is 96% of EPA.
** The actual numbers for NOx:
VW 1500 - 2000 mg/mile per ICCT
Prius 3 mg/mile