Wow, wasn't expecting this great reaction! I agree about the AA, I wanted the background to be minimalistic compared to the car, but I guess I went overboard. The edit looks great! I originally intended to draw the headlights motion blurred off the right of the screen, but I didn't know how to acheive it without using too many colors and occluding the car.

The car is expert level for sure. You did many smart things to keep a good appearance and avoid banding.

Here's an edit where i added four more colors and put some anti-aliasing on the smoke.

Very very good car! Congratulations!

But in my opinion the background seems unfinished.

Some AA on those clouds and this would be great.

The car itself if very great but I think you should make the smoke and the ground  more detailed, so it can be great too :)