On Dec 19, 2006, at 2:37 PM, James Newtons Massmind wrote:

> Ok, now we understand the confusion:
>
> Steve is talking about NOX emissions and Tachi is on
> about greenhouse gasses.
>
>  http://www.epa.gov/otaq/crttst.htm NOX data
>  http://www.fueleconomy.gov Greenhouse gas data
>
Traditional pollutants include particulate matter, unburned
hydrocarbons, carbon monoxide, sulfur oxides, and nitrogen
oxides, right?  The EPA site seems to have info on all those,
though not in easily decipherable formats (IMO.)  Low sulphur
fuel isn't going to fix all of them.  And I'd expect some of
them to conflict with each other; increasing combustion temp
would decrease hydrocarbon emissions but increase NOX, for instance.

"Greenhouse gasses" is mostly CO2; lacking special recovery
techniques, that's going to be about the same emissions per
pound of fuel for any hydrocarbon, so the only variable is
milage per pound of fuel.

> But the NOX issue is due to the sulfur content in the fuel, no?

I don't think so.  NOX happens when O and N from the air get
combined due to combustion energy.

BillW
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