N7E95 [point of likely turn south] to S30E97.5 [center of search area] is 2560 miles
From 18:29 to 24:11 is 5:42 minutes which would mean an average speed of ~450mph.
From page 32 of the report the central flight path to center of search area:
S10E95 on 2141 arc to S18E96.5 on 2241 arc is 561 miles @ 561mph
And from there to S30E97.5 on the 2411 arc is 831 miles @ 560mph
The autopilot works there for the last 2:30 but not further upstream for the earlier 3:12 —
It means that for the central flight path the plane averaged 377mph over the first 3:12 for 1208 miles and then 560mph over the last 2:30 for the final 1352 miles.
That’s not exactly autopilot —