A spaceship has managed to accelerate to 86.6% of lightspeed. Focusing on special relativity would fuel consumption remain the same, better, or worse as opposed to traveling at non-relativistic velocities, what about breathable air? I understand that the rate of fuel consumption would slowly receed as mass was lost through propellant usage, but I'm more interested in the captain's frame of reference and the effects of time dialation upon him and his ship. At .866c, 2 seconds would pass for an observer on earth for every one that passed for the captain, since he needs less time to travel a set distance wouldn't he need less fuel, air, water, etc. too? From his point of view, would nothing relativistic seem to be happening as far as maintaining acceleration, fuel consumption, and closing in on his destination. Would his instruments betray him, would his destination be closer than it should be for his rate of travel? Thank you for your time.