I have been testing my cars in front to back test drives on same road so far, but where I currently live in Dusseldorf I found even better test route. Its a straigth loop. Few days back I tested that I am able to drive that loop around going 80km/h which is a good test speed for aero and rolling resistance balance. 22,8km long route is long enough.
https://scontent-dus1-1.xx.fbcdn.net...Qw&oe=62913B53
First I will be testing my a2 tdi. Just need to make custom ecu program to limit correct IQ levels to reach that speed. Route is pretty level but first testing will tell how well that limited injection works or do speeds get too high on the few turns. The one on the right is the tightest and trickiest. Route there has at least 2 lanes to same direction so impact to other cars is minimal, but still will do the testing later so its safer.