My reasoning:
Unlike starships, it is actually realistic for Scarabs not to run out of fuel.
Nuclear fission rods last for ten years. They power nuclear power plants, navy ships, submarines...
Nuclear fusion is, inherently, many times more efficient in terms of fuel mass use.
Ships run out of fuel because they need massive energy for thrust and especially for things like the FSD, which--if we ever invent anything like it--COULD require the fusion of as much hydrogen as a rather large H-bomb.
A Scarab would use about as much energy as a dump-truck running offroad with ATV-type tires.
A Scarab running on a fusion reactor won't run out of fuel in our lifetime. If you bought an old pre-owned and got really unlucky, you could find the nearest muddy stream, filter it, and use solar power to "crack" enough of it to get the fusion reactor up and running again. Actually scrub that, if you have enough stored energy to restart a fusion reactor, you won't even need solar power. And once you get the fusion reactor going again, that bucket of water will last your Scarab another lifetime.
So worrying about fuel is pointless. If we do have to worry about it, we should be able to refuel from any ocean, lake, or stream, once these things come out in another expansion or two... and then only if ED has been running for about 70-100 years. These things don't run on gasoline, people.
Forum clutter...
Why start another thread when one is already open for discussion?
https://forums.frontier.co.uk/showthread.php?t=173214