It might be. I know Tatsu tested with wheels that had a lower coefficient of friction than those designed to be used, then they slowly mixed and matched until the pacing was correct. There's always a possibility that GCI could have been using a certain kind of lubrication with the intention of achieving the same goal.
Since the bearings on the wheels haven't been broken in yet, the guys typically do whatever they can to make sure the train makes it home. This usually involves manually working the wheels in, varying the lubricants, and making sure the braking system is set to be loose. This usually works out that the fifth or sixth run will be the fastest run the coaster will ever make, as it is then dialed back from there.
The train here is going so fast that the magnetic braking gets "overly excited" and almost fully stops the train before reaching the second set of mag brakes.
^And that's what makes GCI awesome. Only one I've been on is Terminator and that fly's right through the course. There's never a dull moment. I think it only gets to 50mph. With a ride this big, once it's dialed in, it could be over 60mph. I'm there's specs somewhere with that info. Too lazy to look it up.
How about we do some math, yes?
In 135 feet, an object in freefall will reach about 63 mph. Now, that's in freefall, with no friction, no wind resistance, no rolling inertia to overcome, etc. I'm guessing a top speed of about 55 mph, if that.