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Re: Gas mileage?
If you have access to a datalogger that would help you out. if you have one on hand, chk the fuel trims. see if your ecu is in closed loop mode or open loop. the datalogger and tell you if your o2 sensor is out or not.
from there you can adjust according to a s-afc if you have one to get the right fuel trims.
timing will also play a good role in the adjustments of your fuel trims too. it will be good to chk to see if you have the correct timing.
gluck
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