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If you look at a graph of a WOT pull on Datazap what are the MAFv you have at 2-2.5k. That will be the cross over region, it's usually ~2.5v which is why I think the MAF scale changes it's spacing. If you want to use the tool I would:
1) Paste the original MAF scale into both open and closed loop screens and into excel (call this A)
2) Set no upper or lower voltage range
3) Run the tool for both open and closed loop and then paste both into excel (B and C)
4) Remove data from both new scales that is the same as the original, using the formula =if(A=B,"",B) may make that quick and easy (let's call these new rows D and E)
5) Average the 2 scales that only have the changed data using =average(D,E)
When I get my laptop i'll show a bit better what I do.
Yes, the fuel additive appears to be AFR points, -0.1 is richer, 0.1 is leaner. But remember it is a % of where you are. If your fueling is way off the MAF then 0.1 won't necessarily make it 0.1 AFR points leaner, it may be more or less. Again I have a spreadsheet I was trialling. I'll post it up.
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