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Drive slower, drive in one gear higher whenever possible without lugging the engine, accelerate slower.

Keep your bike in top mechanical condition with regular tuneups. Keep the air filter clean and the chain in good condition. Air up your tires to recommended pressures and keep them there.

Don't ride if you can walk - short trips sap mileage.

Brand new engines often get better mileage as they break in. It takes a few thousand miles to fully break in. Follow the factory break in procedure. They know what they are doing when they recommend that.

Have you not understood the inverse relationship between "performance" as you call it and increased fuel consumption.

the service will change little unless it is running badly or fuel is poring out of it.