Fig. 8.

Mean fuel consumption, hFC[l/h], during towing activities against vessel speed, SOG[kn]. Mean fuel consumption is calculated at each homogeneous load condition of the engine. Main characteristics of the monitored vessels (OTB: single boat bottom otter trawler; PTM: midwater pair trawler) are reported in Table 1. On the right-hand side, the mean modelled value of the energy performance indicator EPI at vessel-specific resulting mean speed during towing has been reported for each vessel. Higher is EPI, more efficient is the fishing vessel.