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changing the valve overlap is just tuning it for lower RPM, I think it is a good idea. you can also delay exchast valve opening to get a bit more power out before in opens, same reasoning.
How about removing 2 pistons, and disabling the valves on those cylinders in some way then adding a turbo, that will decrease your consumption. you will need a small turbo to work efficiently at the low flow rates. a turbo can actually do more than reduce pumping loss, it can develop pressure in the cylinder on the induction stroke which pushes the piston down, the energy is energy recovered from the exhaust.
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