Hi, I've been playing a while and now have most techs. With engines there is a tradeoff which means that you don't just automatically put a transgalactic in every shuttle, or even a fission forward.
This tradeoff is both space, and fuel usage (supplying the extra fuel for fission forward is hard). There is also cost; the interstellar, and intergalactic cost more.
When it comes to storage, compressed storage comes with no downsides; it's smaller, cheaper, and more storage than everything else (except perhaps a small for water, if you want to save 1 width and store much less).
I propose that compressed water take more energy supply, compressed air take coolant, and all compressed storage cost more.
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