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lower RPM is much like having a smaller engine, it's how much power is available to how much you are using, more so with a spark ignition engine than a compression ignition (deisel). Small Cylinders suffer from high heat loss to the head at low RPM so peak efficiency is at higher (but not high) RPM. I know the Chev 4.1L in my landrover peak torque was at 1600rpm, and peak efficiency would have been around there as well. For efficiency more cylinders is generally bad, all else being equal, but it seldom is. a V6 Estima gets around 10L/100km, and my 4 cyl one gets 15L/100km. that V6 is a lexus one, and it is a really good engine. Maybe an engine swap for a start? I don't think it lends it self to more mods though, it is too complicated.
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