You continue to misuse those numbers.
Those numbers are essentially an absolute measurement of what amount of
contaminants are present in each fixed amount of exhaust.
For example. If a vehicle produced 1kg of exhaust, 1mg of it might be
contaminant X (or 1ml per Liter if Olin prefers).
To compare these numbers directly is comparing apples to oranges.
You have to take into account efficiency. The 4cyl accord for example
gets 68% the fuel economy of the Jetta .
If you want to compare pollution levels, you cannot continue to use the
units you are using because you are flat wrong to do so. What you would
need to do is create a new unit.
Something like ml per Kilometer.

It's like saying Bob makes more money than Joe because Bob makes $6.60
per hour and Joe make $5.60 per hour.
That statement is meaningless unless you know how many hours they each
work per week. If Joe works 41 hours, and Bob only works 28, then Bob
doesn't really make more money does he? (ignoring overtime)
In fact Joe makes $229 per week and Bob makes $184 per week.

Get it?

That comparison is based on current, pre low sulphur, pre BIN5 emission
numbers.
On a comparison like this, the Mercedes BlueTec kills nearly everything
on the market, right now today.

Also to the equation you should probably add things like cargo room,
passenger capacity, etc.
In a comparison like this, the E320 CDI BlueTec trounces nearly all
gasoline powered cars.
If fact given the actual MPG numbers of the highly inflated Prius, I bet
it would beat that too.
It'll be nice to see Hybrids forced to give real world numbers under the
new EPA testing rules this year.
The Prius' real world HWY MPG is within a few MPG of the E320CDI, but at
greatly reduced cargo/passenger room.




Steve Ravet wrote:
>> None at all. In comparable vehicles and engines, a diesel 
>> produces less emissions in all but NOx and particulates.
>> That's not speculation, that's tested fact.
>>     
>
> That's not what the EPA says.  Here's an excerpt I posted to the diy_efi
> list that had this discussion back in October:
>
> -------------------------------------------
>
> Thanks for the summary.  You may have missed the beginning of the thread
> where I posted certification levels for the 2006 VW Jetta.  There are 3
> non pickup diesel vehicles available in the US, the Jetta, MB E320, and
> Jeep Liberty.  Here are the Jetta and MB numbers, and a gas Honda for
> comparison.
>
> 	Jetta		MB E320	Accord
> CO	.11		.1		.3
> NOx	.55		.39		.01
> HC	.824		.76		.01
> part	.069		.064		NA
>
> I didn't put in the V8 SUV, it would be too embarrassing.  How do you
> clean up the emissions from your diesel Jetta?  Buy a gas Suburban and
> use it to tow your Jetta around town.  You'll be faster, cleaner, and a
> lot more stylish.
>
> ---------------------------------------------
>
> Those numbers came directly from the tab delimited file with EPA
> certification data for 2006 that I posted previously.
>
> --steve
>
>
>   
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