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Old 06-24-2008, 07:58 AM   #4 (permalink)
Shawn D.
Harebrained Idea Skeptic
 
Join Date: Jun 2008
Location: Alpharetta, GA
Posts: 211

The White Car - '84 Mercedes-Benz 300td
90 day: 28.84 mpg (US)

The Blue Car - '86 BMW 535i
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What you're saying isn't possible. If you are reducing the amount of fuel, you are increasing the A/F ratio. It's as simple as that.

However, if the engine has a "feedback" carburetor that is adjusted by a computer, you're probably only adjusting the absolute limit, which the A/F isn't reaching because the computer has sufficient adjustment left.
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