Ok, here's the run down on the different resource gathering ships and their ranges / speeds:
- Small Harvester 250u cargo capacity. Warp Speed 4min per sector. Main use is for in system resource collection
- Harvester 1.5k cargo capacity, Warp Seed is for min per tile. Can collect full capacity from a 2k/hr planet from 6 squares away
- Cargo Ship 3k cargo capacity. Warp Speed 3min per tile. Can collect full capacity from a 2.5k/hr planet from 12 squares away.
- Freighter 5k cargo capacity. Warp Speed 2.4min per tile. Can collect full capacity from a 2.5k/hr planet from across a sector