Quote:
Originally Posted by glangford
SULEV is an acronym for Super Ultra Low Emissions Vehicle. SULEVs are 90 percent cleaner than the current average year's models. SULEVs emit substantially lower levels of hydrocarbons, carbon monoxide, nitrous oxides and particulate matter than conventional vehicles. The SULEV standard steps up the ULEV, Ultra Low Emission Vehicle standard.
This would explain why a n20 and n26 in california have a different smog rating on the epa fuel economy site (6 and 8 respectively) than another state both had a 5 rating. Sulfur in the gas, which competes with oxygen in the catalyst.
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Thanks, that is very helpful. Could you post the URL of that EPA fuel economy site where you found the comparison between the N20 & N26? I looked but couldn't find it. Thanks!