Fast car usually means a hard TT, but we will see.
3 people lost their gold streak in the last time trial. They just didn't set a time. Probably quit the game or real life got in the way, but that's a big streak to lose. 243 all gold streaks remain.
There were 22084 new participants in the last time trial which seemed like a lot at this point, so I thought maybe the game was growing. From what I can see they're estimating 5-6 million copies sold, but less than 10% of those have done a single TT (454 429 to be exact). I guess a lot of people just haven't even dabbled into time trials so far, or don't play the game anymore, but don't think you can say the game is growing even though more people are trying time trials now.
Of those that have done one there's 5486 A+ drivers, and 16 346 A rated drivers. My guess is if you like the game enough to get an A+ rating in sport mode, then you've probably done at least one time trial by now for some easy credits, so I don't think there's that many more A+ drivers worldwide. Some of them probably don't even play anymore. Shows how small sport mode really is.