Was your test drive the first time you'd driven a M3P, or even a high performing EV (talking about something other than a "compliance" EV)? Could be that you just weren't used to the brutal feeling of the acceleration curve, then when you got it at home, it wasn't such a shock.
My SC didn't have a M3P on the lot for me to test drive (the one they had set aside from me sold before I got there!
), but even the Dual Motor LR I did drive felt insanely fast based on what I'd driven, which included some pretty hot ICE sports cars. I have no evidence to
prove you're wrong, but a few considerations:
1. There is no such thing as a dedicated test drive car. They just let folks drive the cars they sell. It seems to me it would be very difficult (though not impossible) to have a different power profile and switch it back to the "consumer profile" before it's sold.
2. The amount of work that would need to go into making dedicated test drive profiles would seem incredibly large just to have a vehicle that performs a little better at the dealership.
3. Why
would they do it? I gotta believe that the minimal upside of potentially selling a few more cars based on increased performance would not outweigh the negativity they would evoke if word ever got out that they're intentionally misleading the public. It's a pretty easy thing to verify, so it would be very difficult to hide forever. Worse, up until very recently, all of their cars had a 7 day return policy, so if that was truly happening the losses they would take from returned cars would probably be huge.
It might just be the old butt dyno wasn't calibrated for the test drive. I've certainly been there. Occam's razor.