Ok I read this whole thread and did not see no comments on when to do the test. All conditions are usually best on the night.
- It is not so windy
- Threre is not so much traffic on motorways
- Temperature changes are not so big
You can usually see at least here in finland the estimated temperatures, water and even humidy for the next day for chosen city... So it is easy to pick up the best night conditions to do the test you have planned.
Night is especially good if you are doing coast down tests. You see if there is coming other cars from the ligths.
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