Tuning with a wideband that someone guesses is 1 point richer across the board than listed is not a reliable way to tune. The interesting thing, is it's not uniformly 1 point richer across the sensors operating range. At 14.7:1 it's actually very accurate. I don't like to guess when tuning....the more accurate data you have the better, IMHO, especially when the OP is tuning a car for the first time.
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