Just did almost a half tank with my aluminum duct hose HAI totally up against the Exhaust Manifold, and judging by the gas gauge, I have gotten poor FE. Maybe like mid thirties, as opposed to my average 41-43mpg. Not having instrumentation sucks, but I just backed the hose up so it is parallel to the em, allowing sufficient cool air. When i moved it, it was really hot! Wish I could monitor the IAT in realtime, rather than all this guesswork.
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