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I would start, by changing air and fuel filters, and go to a lighter grade synthetic oil.
Aerodynamics will do very little below 55mph. It appears to me your engine is just horribly inefficient.
At that cc, your engine should be running at 1500rpm. If it's doing 2k or more, gearing is also to blame for it.
Perhaps time to change piston rings, as well as change the head gasket, and check the cylinder bores.
If the piston rings create blowby, your oil is very black every oil change, and new piston rings will do most of the mpg gains.
But if they're good, and air and fuel filters are good, I figure you probably can gain 2 to 5 mpg at best, by tuning.
It has an overly large engine, that produces the same amount of power (or less) rhan a 2.6 liter Ecoboost engine from Ford, which is half the size, and double the mpg.
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