1.6 Diesel transmission gradation funny ??

Hello Drive for 7 years car and my new C-30 R-Design 1.6D MY09 is the first in which I noticed the circuit extremely well. I can’t switch to the 4 gears in the city at 50 km/h without becoming extremely low-touring (drive the moter and want to avoid that) With my old S40 1.6 petrol engine I drove around at 55 km/h in the 5 gears now I can only turn at 75 km/h in the 5th gears with the 1.6 diesel it comes to me that the 3rd gear is translated for the 3rd gears i.e. when I switch to the 4th gears the number falls extremely (in contrast to the other gears). Have read in a test that the 3 gears is translated briefly to speed up better. At work I drive a Citroen Jumpy with the same 1.6 diesel engine there I don’t have these problems What do you mean?