I think you already have the most important things covered.
Also, keep your engine tuned and your chain well lubricated.
A worn cam chain can also increase fuel consumption, as the valve timing gets retarded. Replace it if your consumption goes up and it's worn.
As engine and exhaust tuning is as much an art as a science I don't think there are guidelines on which system is more efficient than another, plus most people seem to have no interest in the subject. They only want more power and/or sound.
Wide luggage (ali panniers) and flapping clothing also increase consumption.
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