Secondly, I'm constantly being told I don't have enough fuel to make the jump I want to make, but the Galaxy Map has no indication of fuel required. So you have to do it by trial and error. Or am I missing something?
Yeah I ran into the same thing, but it seems it's only about direct jumps. You can still make it via intermediate jumps. The UI isn't very clear about this and there's definitely a need for a little UI rework to make travels over multiple hops easier to do/plan.