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Improving engine breathing is the way to go in my opinion.
If you have done a freewheeling setup, a more efficient "Pulse" will reduce their duration, could help with mileage.
If you can not P&G, improving engine breathing can only return gains if you can alter gear ratios (maybe with a set of heavier than standard weights in your CVT ?)
Taller gear ratios (through closer front pulley)s means for a given level of acceleration, your throttle body is opened more meaning less pumping losses.
Obviously, using more air means more fuel so it seems counter intuitive.
But it has been the recipe for eco tuning vehicles for long : tall gear ratios.
Maybe you can play with inlet temperatures to further save fuel (and maybe offset the need for tuning it richer)
If you are after money efficient modification, then you can never beat a free mod ...
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