I asked my service rep to contact Tesla yesterday to push V8 to my 90D because I had a 400 mile drive today and wanted to see what people were complaining about with regard to degraded TACC and lane keeping. Tesla pushed the update, 2.40.21 mid-day yesterday and I did the 400 miles between LA and San Francisco today. TACC is much improved, especially in transitioning to a stop, much more gentle, and beginning to stop or slow by reading 2 cars ahead. It does this very well now. Lane keeping also seems much improved to me. Initially, it took few unexpected dives toward the center divider, even over the left lane line, on the 405 and a few unexpected moves towards cars on the left, but by the time I reached the 5 FWY all was well. I probably passed several hundred semis today, and not once, after the initial few swerves toward cars on the 405, did it gravitate towards a semi on the right. In lane keeping, the car tracked very well today even when lane lines were less than clear in construction areas. I probably did 340 of the 400 miles with lane keeping today and it was for me a much more confident drive. There is still a slight bias to the left lane though.