On page 110 of the Revenge of the Sith novelization, we learn how vessels can evade hyperspace tracking, inasmuch as not revealing your destination on account of which way you were headed.
"[Grievous's escape vessel] would then make a series of randomized microjumps to prevent being tracked before entering the final jump to the secret base on Utapau."Later, Obi-Wan himself uses such a technique when escaping Utapau in Grievous's own dented fighter:
"Obi-Wan took General Grievous's starfighter screaming out of the atmosphere so fast he popped the gravity well and made jump before the Vigilance could even scramble its fighters. He reverted to realspace well beyond the system, kicked the starfighter to a new vector, and jumped again. A few more jumps of random direction and duration left him deep in interstellar space.This is possibly the technique used by Solo when departing Tatooine with Luke and Obi-Wan and the droids, too . . . either at Tatooine or some other locale en route. It was something like a 1.5 week trip, after all:
"You know," he said to himself, "integral hyperspace capability is rather useful in a starfighter; why don't we have it yet?"
While the starfighter's nav system whirred and chunked its way through recalculating his position, he punched codes to gang his Jedi comlink into the starfighter's system."
I bring this up because it is claimed by Brian Young that Utapau visibly shrinks in the distance behind Obi-Wan as he's leaving Utapau, and this is claimed to represent uber-acceleration. Obviously, it does not, as we know that Obi-Wan was cutting in the hyperdrive here and there."You know, even I get boarded sometimes, Jabba. Did you think I dumped that spice because I got tired of its smell? I wanted to deliver it as much as you wanted to receive it. I had no choice." Again the sardonic smile. "As you say, I'm too valuable to fry. But I've got a charter now and I can pay you back, plus a little extra. I just need some more time. I can give you a thousand on account, the rest in three weeks." (ANH Novelization, Ch. 7)
One could argue that Obi-Wan getting out of the gravity well and into hyperspace before a ship could launch fighters is indicative of some massive velocity, but since we don't know when the fighter was detected (indeed, technically we don't know it was detected at all), we have absolutely no time limit on this whatsoever.
As such, the scene is useless for sublight acceleration calculations.
(In addition, there are other less important problems, as well. For one, the shot of Obi-Wan in the cockpit features lighting changes inconsistent with the view through the window . . . that is to say, it's like a bad old movie where the road was projected on a screen behind the actors, but even as the road was winding the light on the actors didn't change.
Similarly, the space shot that Brian makes claims about features a visible star way, way in the wrong place. For the planets to be lit by that, it would have to be what one might call an "extremely compact quasi-stellar object" (ECQO) in close orbit. Otherwise, the planets should look like the merest slivers. The only other alternative would be to argue that the field of view is profoundly monkeyed with in that scene, and even possibly being actively changed throughout it, which is a possibility but would then also render its use as an acceleration guide kaput. Given that the star moves much like the moons do, it seems it must be either an ECQO or a monkeyed scene.)