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Old 07-31-2017, 01:34 AM   #10 (permalink)
mwebb
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Join Date: Jul 2009
Location: New York
Posts: 513

no nickname , it's just a car - '04 volkswagen golf tdi
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in a word no

according to tests conducted by EPA and by IATn

up to a 50% reduction in flow through the air filter causes exactly
zero decrease
in fuel economy at cruise

so an unmeasureable decrease in flow from a carboned up Tbody will have no measurable effect on anything

you may set a fault for IAC unable to maintain correct RPM

however
reduction in EGR flow will decrease FE at cruise

so it pays to spend some time on the EGR plumbing
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