Small production cars at Lime Rock- 4th to 3rd at the end of the main
straight, 3rd to 4th coming out of the esses, until checkered. All done
manually, of course.

F1s have a variety of servos such that you just toggle up or down a
gear at a time. Throttle is fly-by-wire, and control is integrated into
the above.

Mark Donohue was a master at determining gear ratios for endurance
racers to minimize gear changes. Keeps engine under load higher % of
time- goes faster.

J