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Old 02-15-2011, 06:45 PM   #1
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How does ignition timing change affect MPG

I'm very limited to what changes I can make to my Expedition with my programmer. My question right now is whether advancing the ignition timing will help or hurt MPG. If it's advanced then power will go up, but then again if I'm driving as easily on the accelerator as possible then does it really help? And if the spark occurs closer to TDC then although the compression in the chamber will be less, the fuel will be burned for a longer period of time after TDC. I'm thinking that if I'm driving extremely lightly like I have been than retarding the timing may help MPG? Or is the ultimate goal to make the absolute most pressure in the combustion chamber without detonation (advanced timing)?
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