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Maintenance is always step 1.
Getting more air flow than stock usually isn't good for FE.
The ECU will counter a lean mix with more fuel.
Cutting holes in the airbox is a modification to get more power - often done on motorcycles as well, that is if the whole box wasn't thrown out altogether.
You might want to test again with the holes covered, and see what that gives.
Cold air intake works on diesels, petrol engines usually prefer a warm air intake for better FE.
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Strayed to the Dark Diesel Side
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