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Interesting idea. 10-15% does seem like a lot since you are still pumping air. However, it would be great to see what you can do just with some electronics.
If you reprogrammed the arduino to sense cylinder deactivation, you could just cut your fuel use calculated by 50% when the cylinders are deactivated.
To monitor air fuel ratios when in cylinder deactivation mode, you'll probably need a wideband oxygen sensor. A narrow band sensor simply won't be able to monitor air fuel ratios outside its designed range.
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