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Just because I cannot resist...
At 70MPH, a north america 2017 manual transmission 86/BRZ with stock tires will be at 3153 RPM. Change the model year to 2013-2016 and hold every other constraint and the answer is 3007 RPM.
Because math. Relevant data:
2013-2017 stock tire diameter: 24.62 inches.
2013-2017 MT 6th gear ratio 0.767
2017 NA MT ring and pinion: 4.30
2013-2016 NA MT ring and pinion 4.10
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