Playability of STL Only Interstellar travel in GURPS?

[Cpt_Clyde]

In facing a similar problem for my new TL10 campaign I came across this thread..... which did not seem to offer any solutions. So this is what I came up with:

In my setting there are jump drives which allow interstellar travel (and use fuel), but I wanted viable fuel dependent STL travel within systems. I have decided to take the "miles per second" (mps) speed of each ship as written in the Spaceships book series and simply turn that into the number of AUs the ship can travel to before running out of fuel. This simulates very high efficiency fuel consuming engines which can then be treated as "reactionless drives" for travel time and combat calculations since it is assumed the engine is always boosting for half the trip and decelerating for the rest.
This seems to give nice travel times (for my purposes). For example, the "Outlander-class Deep-space freighter" from SpaceShips2 would have a range of 90AU. In our solar system this ship could get to Pluto (40AU away) and back to Earth without refueling.
Another example: The Kiev-Class Farhauler with 20AU range could reach Uranus (19AU) before refueling, but would be cutting it very close trying to get to Saturn (9.5AU) and back.... it may have to refuel at Jupiter on the way back to be safe.
Now looking at speeds in the above examples the lumbering Outlander has an acceleration of .01G. According to the reactionless drive travel time chart in Spaceships it would take about 9months to complete the round trip to Pluto. And the Farhauler with it's acceleration of 1.5G could get to Uranus (19AU) in 10 days.
In Contrast, this make closer planets like Mars (.5AU away from Earth) only take 2 days to reach at 1G acceleration or 27h at 3G so now the solar system is closer to a Fantasy setting's travel distances between towns/adventure-sites.

This would not however make interstellar STL feasible, only interplanetary travel.
Hope this helps someone.