Made up technical answer:
On public roads? 25MPH faster than other traffic is fast - need to be on the ball.
On the track? .05g below max traction (for braking/acceleration/turning) on high consequence sections of the track (i.e. little runoff, high speed) or 0.01g below on low consequence sections is fast.
Real Answer:
Like porn/obscenity - you will know it's fast when you see it as fast.
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G87 M2 BSM On Order
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