How to save fuel on a bike?

ease into accelerating

Research “Hypermiling” on YouTube or on individual websites. You can employ hypermiling techniques to improve your gas mileage. When gas was over $4.00 a gallon, I was riding a dual sport that got 58 miles to a gallon. Bike used to get around 50 mpg. Changes how I rode and rode further before needing gas.
It is easy to save on fuel with a bike due to the manual transmission.
Another incentive, take the extra money you would have spent and put it into a separate savings plan. Soon you will have enough money for a nice vacation.
Good Luck

drive smoothly , avoid harsh acceleration and braking . check your tyre pressures too

It sounds as though you’re the one with the problem, not the bike. Sure, a clean air filter, new plugs and tires aired up will help, but only a tiny bit (except when the air filter is really nasty). And there’s nothing wrong with riding briskly because it can be fun. But if you’re trying to save fuel, then some of the fun has to go. That means shifting at moderate rpms, say 5,000 instead of 10k. Let up on the gas some distance before needing to stop rather than going full tilt and then doing a stoppie all the way up to the gas pump.

And is it all worth it? If you go from an average of 40 mpg to 45 mpg, that’s a 12.5% increase, which sounds pretty impressive. I put a pencil to it and if gas costs you $2.65 a gallon, for every limp wristed 1,000 miles the extra 5 mpg will save you a grand total of $7.36. Enough to buy you a super sized meal and dessert at McDonalds. So which is more gratifying, a 30 minute meal at Mickey Ds or 1000 miles of highjinks?