Reply #1: Another 'redoubtable' "study" from Exxon-Mobil's favorite Petro-University - Stanford. [View All]

[JohnWxy]

some interesting quotes from article:


"Ginnebaugh worked with Mark Z. Jacobson, professor of civil and environmental engineering, using vehicle emissions data from some earlier studies and applying it to the Los Angeles area to model the likely output of pollutants from vehicles.

Jacobson is the author of an earlier study, that has been criticized for questionable methodology and unrealistic assumptions. Any guesses where the "vehicle emissions data from some earlier studies" came from?????

Ginnebaugh said that they found that E85 had greater emissions under cold weather conditions.

and then elaborated:

"The problem with cold weather emissions arises because the catalytic converters used on vehicles have to warm up before they reach full efficiency. So until they get warm, a larger proportion of pollutants escapes from the tailpipe into the air."


......."until they warm"... now by "warm" what temps are you talkng about? and uh, how long does it take to warm to that temperature? 10 minutes? 15 minutes?... 5 minutes???


oh, and regarding the.... "vehicle emissions data from some earlier studies"... here's a couple comments from a well known critique of Jacobson's 2007 "study"


http://www.ethanolrfa.org/objects/documents/1071/reapresponse_jacobsone85.pdf


"Conflicts with U.S. EPA Analysis and Other Agencies

E85 and other high blend ethanol/gasoline fuels warrant further analysis. However, Jacobson’s study already stands in stark contrast to work done by U.S. EPA, the California Air Resources Board (ARB), the National Renewable Energy Lab (NREL) and the South Coast Air Quality Management District (SCAQMD)."
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"relies on 1991 vehicle data for establishing inputs to the model (there were virtually no cars certified for E85 use in 1991). The report also seems to ignore that formaldehyde emission rates from recent FFV certification results indicate that formaldehyde emissions from both gasoline and E-85 are well controlled by latest catalyst technology, and both fuel / technology combinations provide a substantial margin of compliance with ARB’s strict 15 milligram per mile HCHO (formaldehyde) standard, as shown below:"
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Stanford University is the recipient of a $100 million grant from EXXON-Mobil