Quote:
Originally Posted by S14DB
Friend and I were having a discussion that made sense. When you have a MAF and you vent to ATM the ecu thinks the air went through the engine and you run rich for a few sec. This is wasted gas and decreases MPG. When you recirc the air stays in the system and extra fuel is not added for air that is no longer there.
Has anyone noticed a major MPG diff when switching from Recirc to ATM or vice versa?
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Well technically no extra fuel is ever added. The italicized part is right (Instead of using that fuel effeciently to make power, its lost. Lost fuel equals lost mpg) but the bold part, no extra fuel is ever added, remember the air is already accounted for and thus the computer already has the values for how long the injectors should stay open for.