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Interesting, the ECU is okay with the NB sensor being disconnected? My car also had WB sensors + a narrowband, and the narrowband would kick in at cruise to correct my lean biased WB, foiling my lean burn attempts.
20 is plenty, don't get greedy. In fact the sensor accuracy at 20:1 is not that good, I wouldn't go over 18. Yea, you don't save as much fuel, but there are rapidly diminishing returns after that point because combustion temp and stability fall.
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