In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bennettdan wrote:

I agree with you on that Capt. Quirk its that most motors with a 14.7 to 1 AFR tends to have the best fuel economy but most high power vehicles run around 12.5 to 1 its just depends on the motor and combo of parts on it..

The standard o2 sensor outputs a very small voltage change between 12 to 1 up to 15.1 so the tunning is not as accurate with a standard o2 sensor the standard one use .45vdc output when it is at 14.7 to 1 and the wideband o2 sensors put out 2.5vdc at 14.7 to 1 and have a much wider reading range this makes tuneing with them a more accurate situation..

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