GR basic speed was 201kts + allowance for fuel/stores.
That's 2 knots below the basic weight speed for our two-seat F-105Fs with the wings as far forward as they would go.
The old F-105 actually had the best basic auto-pilot for heading, altitude or attitude hold I ever saw in a fighter aircraft. No coupled approach capability and no auto-throttle of course. No fix-to-fix nav as such because there were few RNAV fixes defined at the time anyway, but one became semi-skilled at TACAN radial/DME point-to-points within reasonable tolerances.
As far as coupled ILS capability in fighters....
....Was in the back seat of a Guard F-101F on an FCF at Niagara Falls one day, and when the USAF advisor doing the check gets to the recovery he says "Let's check the coupled ILS capability." LOC intercept was reasonable with some minor 'S' turns but when we got to GS intercept, the VooDoo briskly pitches down about 10-15 degrees
. Captain Obvious disconnects, and says, "That's not right." Fortunately we didn't have enough gas to try it again.
My 101 checkout was to start in about 2 weeks, but got an offer to go fly a fighter with only a yaw damper, no auto-pilot, and at that point this seemed very appealing.