The reason I used one litre/hr more on the Cape York trip, when we both had slats, is that I run a 4-blade prop pitched for climb, while he has a 3-blade prop pitched for cruise. He used 16 litres/hr both trips which provides a good reference. On both trips I was flying in convoy with another Savannah with slats. on the trip to Tasmania without slats I used only 13 litres/hr, averaging 75 kts both trips. On the trip to Cape York with slats on I used 17 litres/hr. The large reduction in fuel consumption was the biggest surprise – 23 %! This was measured accurately and consistently on two long flights (50 hrs each) to Cape York and to Tasmania, from near Brisbane, Queensland (that’s equivalent to flying from Seattle to Anchorage, then Seattle to El Paso). '09 Flight to the Bight and the South Coast.
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