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Old July 31st, 2019, 18:24   #286
Join Date: May 2010
Location: Los Angeles, Ca.
Fuel Economy: 42-50 mpg

Originally Posted by Mike14VW View Post
Whatever you guys wanna think, changing the clogged/dirty fuel filter will maximize air/fuel ratio and as result, gas mileage will increase.

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Thatís just an incorrect statement. The maximizing of the A/F ratio is done by the oxygen sensor & the feedback controls. Stoichiometric fuel mixes come from the emissions system toggling rich/lean to achieve stoichiometricity & thus maximizing the air/fuel ratio. A plugged or restricted fuel filter will usually affect power, but you can still have a maximized air fuel ratio.
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