Hey mate , We burn 100 Litres of fuel to the mouth of the Berkley from Wymdham in good/fair weather in a 7.2m plate boat with a 225 Suzuki loaded for a few days . Its approx another 80ks to the mouth of the KGR . The mouth of the Berkley is shallow sand bars and not recommended at low tide , recommend approaching from the inside of Revelly Island . Usually takes us about 2 to 3 hours to get to the mouth of the Berkley in good/fair weather with out stopping for a fish etc . There are places like in behind Thurburn Bluff to tuck away out of the Northerlies if they come up although dont recommend the creeks behind Thurburn you will need at least half tide rising at most times , the southern side of Buckle Head is ok in a northerly or an easterly although shallow in places once you tuck inside the bay . . Recommend the BOM Site for tide predictions going round to KGR . You will notice the tides in Wyndham may be 6 or 7m movement and at Revally Island they move considerably less on the same tide . We work on 1 Litre per kilometre for fuel consumption in fair weather @ about 3800 to 4200 rpm. Mid year the prevalling wind is an easterly and can be quite strong . Better boating weather in the warmer months September to April although obviously can be stormy and hot but if you want waterfalls etc its the best time . As Ross has pointed out above pick your weather and tides 10 – 15 knots out the front is bearable but 20 + Knots youll hate it or youll err on the side of staying put . Enjoy Mate !