Tom W wrote:
The mirror steamer is awesome. Because you can right away start ferrying up fuel tanks to HEO or even out to the asteroid belt for later pickup and refueling if you main rocket.
That generally doesn't actually save you anything, though, unless you're running up against the hard limits. At least since the Mirror Steamer is mass 0 it doesn't COST extra, but for heavier thrusters it does.
What you CAN do is take a robonaut somewhere with it and start mining fuel while you're trying to accumulate the other cards you need. But because that also uses up your Operations, it may not be helpful either.