Tips on improving Fuel economy - 3.0i E53

[scirocco]

Although an old hand at Mercedes W126's, I am new to the BMW world. Just bought a 2001 E53 with a 6 Cylinder engine (3.0i).

I was wondering if members can provide me tips / mods / maintenance that can be done to improve the fuel economy.

Items like Tire Pressure, Air Filter, Spark Plugs would of course be in this list. Somebody told me that replacing the fuel filter also works but I find that difficult to believe. Can I do some mods / updates to the ECU? I do have the INPA Ediabas OBD software and cable.