The advantage of freer flowing air is that when you do request more power by dumping in more fuel you can get the air to burn it rather than just dumping it out the exhaust. So, you may not see a FE improvement, but you may see improved drivability.
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Driven: 2010 VW Golf TDI
Driven less: 2001 Audi TT Roadster (225)
Parked: 1982 VW Jetta Diesel
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