> 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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