Propeller Cone Fin Installations Save 3-5% in Fuel Consumption: Hydrex 24 November 2022 The equipment can pay for itself within a few months, according to engineering company Hydrex.Author: Capt. Johnhttps://shipandbunker.com/news/world/857162-propeller-cone-fin-installations-save-3-5-in-fuel-consumption-hydrex