Data field average speed after lap button pressed

I'm looking for a feature on the 830.
I have several data fields on my screen, including the "average speed" field.
Is there also a data field that shows the average speed after pressing the lap time button?
And that not the part for pressing is counted.
So first half an hour 15 km/h drive, press lap button, half hour 25 km/h drive and that the data field indicates 25 km/h and not 20 km/h.