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Ok, so the face mask thing really made me think about clogged air filters, and actually if I didn't find conclusive threads about snorkel modification and mileage, I did find two interesting threads about clogged air filters and mileage (can't post links yet):
Thread "New study shows 0 impact of a clogged air filter on fuel injected cars"
-> Very interesting reading from the EPA website, concluding to absolutely no difference in fuel economy between new and clogged air filters.
Thread "The Great Filter Debate"
-> post 17 is an interesting testimony in this direction
This confirms what I was thinking, and I can't see why these findings couldn't be extrapolated to any kind of modifications of the air intake system before the throttle body.
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