Just finished pitting a few of the old Drive cars against the two starter Overdrive cars --- as usual the older cars would fishtail, so I took a look at the rear tires. The new Overdrive tires are much softer -- you can feel it while on the car but if you want to see how extreme the difference is, remove one of the Drive tires and compare it with a removed Overdrive tire.
And that new rubber makes a huge difference.
I experimented a little, and it wasn't easy because the new and old tires aren't quite the same size, nor do the wheel grooves match. But, you can fit them for ten or so laps. The fishtailing completely stopped when I fixed the new tires to the old cars, and the new cars definitely had a hard time with the old tires.
This makes me think --- just like on the street, tires are INCREDIBLY important. Of course, there are a few differences, my street car for example doesn't have hard plastic front tires, and doesn't steer by varying the speed of the rear wheels, but still .... TIRES! Anyone know of any aftermarket Anki-compatible tire suppliers?
Note: I did not try the old cars, old track, old software but new tires -- it's possible the old software relies on a specific level of stickiness.