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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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