When to change gear for A6 1.9 TDI?

I just bought Audi A6 Avant 1.9 TDI made in 2004. But fuel consumption is much higher than that in document. Maybe I have a bad gear changing behaviour. I normally change gear at 2000-2500 rpm. that is to say, to 2nd gear at 15 mph, 3rd one at 25mph, 4th one at 40mph, 5th one at 60mph. Shall I change gear earlier? how to achieve a balance between fuel economics and engine maintenance? Thanks a lot.When to change gear for A6 1.9 TDI?
You are shifting at the right speeds/rpm. Keep this in mind the documented fuel mileage is an estimate, therefore it will vary. The car is 4 years old, however you may want to replace the air filter, and the fuel filter and see if that helps.When to change gear for A6 1.9 TDI?
I'm afraid you'll never get the documented gas mileage. Prior to 2008, gas mileage figures were fantasy..., the numbers that were obtained for all cars were under perfect IDEAL conditions, conditions that mortals cannot do... That's why in 2008, all cars gas mileage figures are lower than they were in previous years...nothing the car makers did, just a more accurate way of reporting miles per gallon.