2.0 TDI 140 hisssss when cruising at 65-70

spencer361

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just interested to know if anyone else gets this, cruising along at 65-70 mph with my foot down 25% its almost like There is air escaping and making a slight hissing sound. I'm guessing its through the turbo waste gate or intercooler pipes. I had the pipe seals changed a year ago. It just seems like wasted air to me and could be used to to improve economy and use the loud pedal less.

Or am I barking up the wrong tree?
 
I hear the hiss on mine every time the car reaches around 1.9k revs when cruising in 3rd-3th-5th gears if that helps?