They don't dyno in the highest gear for the whp #s. They only do that when they are doing a high speed run as mentioned. For a 5spd car it's usually in 4th gear on the dyno for the whp. 6spd cars usually are 5th gear dyno run. RWD cars on average are 20% loss through the drivetrain. FWD is like 15% and AWD is like 35-40%.
For the record, I use a Dyno Dynamics to get my numbers from.
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