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I would say the mpg increase would be more than 0.5%.
Just changing the old thick and dirty oil and replacing it with the new gear oil in the same weight would be about a 0.5% increase.
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97 Passat TDI Wagon
Bosio 520 DLC nozzles, chip tune
Mufflerectomy, ALH Injection Pump
317k miles
Scan Gauge II
full belly pan
26 gallon tank 
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