Help me out with some math
I'm having trouble increasing the FE of my Protege, and I think I may have found part of the reason why. Driving home just now, I was on a street doing 40mph with the cruise control set. Level ground, and my FE was 33.4mpg. I used the cruise control to accelerate a bit. Monitoring my SGII, I saw the FE drop from 33.4 to 17.4 during the acceleration. Roughly half.
The math: Half the FE means twice the fuel, right? Assuming a steady-state fuel mixture of 14.7:1, doubling the fuel would richen the mixture to approximately 7.35:1. That's incredibly rich. Enrichment shouldn't drop the mixture much below 12:1. Forced-induction setups can sometimes require richer mixtures, but not a street-tuned normally aspirated engine.
Thoughts?
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jharbert 
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