Your a very clever and ingenious guy Woody, but 12.8 still seems a little high isn't 12.1-12.5 more the magic number for motor longevity?

J-fire he is tuning his car's air/fuel ratio by adjusting how much fuel pressure makes it to the injectors.(he is manually tuning his car)

the purpose is to keep the motor from running too lean and killing the engine. When you hear people say a air/fuel ratio of 11.5 whats basically being said is when your motor runs a combustion cycle there is 11.5 times as much air as fuel. When that number gets higher say over 13 to 1 ratio of air to fuel your running to lean and potential destroying your motor.

I hope this helps the confused understand.

Woody was that your Fast and the Furious explanation?(god that was hard to read)