Johnny's thoughts:
Fuel flow. We've no fuel flow indicator so we don't know what we're burning for various engine speeds, so we can't work out how many litres to the nautical mile we burn or, more importantly, safe maximum range (with a suitable reserve). We brimmed the tanks before leaving Syros so that we could back calculate range, before setting off on the long offshore legs. At Marmaris we carefully noted how many litres each side took, then Gordy calculated the sea miles that we had travelled since leaving Syros. It wasn't completely 'clean' because we travelled at about 10kt average during the stormy day and then 15-20kt on the other 2 days. Nevertheless we came out with a 5.25 litres per nautical mile result, giving us a safe range of about 260 NM.
Yesterday was much cleaner in that we travelled the whole way from Marmaris to Finike at one speed, about 18 kt. Gordy and I separately calculated that the fill up would probably be about 600 litres. However, the fill up was 768 litres, giving us a fuel consumption of 6.8 litres per mile. This still makes no sense to me. Either the boat uses dramatically more fuel per mile at 18kt or we were venting fuel overboard somehow (I'd expect more but not double). There were a few valves in a non-standard position (fuel cross feed open and fuel tank sighter glass valves open) but I wouldn't have expected these to change anything.
Net result is that we have to do the Finike to Paphos leg slower, and measure the fuel consumption closely again. All fuel valves are in the 'standard' position and we're cruising at a measly 13kt. At this speed, expected transit is 11 hours so, to avoid an arrival into a new port in darkness, we set off before dawn.
The next question is 'how will this effect the Cyprus to Egypt leg', which is much longer than today's leg. I think it would be undesirable to arrive after dark; there will probably be more than 100 ships in the Port Said area and we don't know how good the channel and port lighting will be. If we want to arrive before sunset using today's speed we need to set off at midnight tonight, having arrived at about 18:30, with a refuel, engine service (they are super hot for at least 6 hours after stopping) and formalities to complete in between.
I've discussed it with the team and our plan is to stay till mid afternoon tomorrow then sail through the night to arrive about 2 hours after sunrise. It'll mean introducing a watch system and making sure everyone understands night man overboard drills, but it will give us some time to rest in Paphos, time to service cold engines, time to explore Paphos and maybe fix the odd boat snag. It will also see us depart and arrive by day (and it will still be day if we arrive several hours late) and, because we're there early Saturday morning, complete formalities without any delay over a late Friday arrival (Arab weekend Thursday and Friday).
The joys of confusing fuel flow!