From my experience with other remote tuners, they have you do 3 logs in 3rd gear which will push you to ~80mph (~130kph). Still dangerous on normal streets. Little easier on the Interstate/Autobahn.
Dynos typically run in 5th gear only because it's the closest (or is the gear) to a 1:1 ratio to give the most accurate readings without reaching the maximum speed of the dyno. Logging can be done in any gear, but 3rd gives accurate readings within a relatively short window.
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