What version are you running and do you have the game patched to at least 1.4? There were some previous bugs in earlier versions that caused this.
Are you running any mods?
Fact as others stated, you get more milage by staying on the surface with the best speed being 9-10kts. Takes much more fuel to use engines to charge batteries, that fuel much better use running the surface.
Can't remember stock, but most supermods add the icons where you can check fuel range at current speed, so you know if you can make it.
One big mistake is getting battery damage which causes the batteries to never stop charging. Check you battery charge icon, if you're battery is 100% charged, but still charging, you need to cut the battery charge off yourself manually so the engines will stop charging it.
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