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Old 04-17-2008, 10:50 PM   #7 (permalink)
trebuchet03
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Join Date: Dec 2007
Location: Bay Area
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The Miata - '01 Mazda MX-5 Miata
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Quote:
Originally Posted by Duffman View Post
Fuel efficiency should should follow CO & HC reductions. NOx is the one that is fought at the expense of efficiency.
Yes - that's what I've been hearing for so long.... Lower NOx - lower FE.... Except, NOx standards were tightened - and fuel efficiency went up. This suggests R&D went into engine design to overcome the challenge.

What you said is true - for a case by case comparison... But step back and look from the designer perspective (the person being told to make it more fuel efficient AND put out less NOx), not the end user.
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