I basically agree with this. Oil tank at lvl 2 is 90, which lasts exactly one night. After a few upgrades, primarily Guiding speed, it becomes trivial to guide all ships, except maybe if one spawns too late to guide. While this is cozy and all, I'd expect upgrades to have at least some more effect than making it slightly easier to guide all of them. Hitboxes are a bit wonky when passing the lighthouse close to the light source, which might matter marginally the first couple of nights.