Question: Rimmer says he's been hiking through the diesel decks. Given they've been flying for 3 million years, wouldn't they have run out of diesel absolutely ages ago?
Answer: According to Rob Grant, Red Dwarf gets propulsion power from the giant rock in her underside and power for the lights comes from the solar panels (which are referenced in the episode 'Confidence and Paranoia'). The diesel engines are likely there for backup purposes.
Answer: It depends what the diesel is needed for. Holly would likely have switched off anything unnecessary during that time.
Andy Benham ★