It pains us to say it, but with fuel costs as high as they are, the only way we can save money on fuel is to be more economical with the throttle.
Motorcycles, in theory, are fairly frugal. The engines are small, they don't have much weight to pull and they're pretty aerodynamic, so ridden with a little self restraint they'll return some decent fuel economic figures – and general speaking, the smaller and lighter the better, the smaller and lighter the better. Saying this, on one of the stupidly powerful motorcycles in motorcycle history, without trying to hard, we easily managed to surpass 20 kilometers per liter, riding not faster than 110km/h.
You can buy a Royal Enfield that advertised does over 35 kilometers on a single liter fuel, but then you may get fired for being late. Like with any ride though, you've got the choice of getting up earlier and going slower, or diving out of bed and rushing like hell. The key to economical riding is to accelerate smoothly. Getting your motorcycle away from its stationary position is what really slurps the fuel – roughly 50ml to get you away from the lights swiftly and up to 160km/h, which on a big bike should be about 150 meters away.
So, pulling massive away from every set of traffic lights is not going to put ff your next trip to the petrol station. Judging corner speeds is another good way to save fuel, and to improve your fuel economic riding.
Any braking means a waste of fuel, so if you can judge your speed well and turn into a corner without braking then you're saving fuel and getting skilled in one!
Without sacrificing too much speed, you can knock nearly 2 kilometers per liter off a ride and 3 to 5 kilometers per liter may be feasible if you're not too bothered about when you get to your destination. If you're doing 9,000 kilometers a year, then you could look to save about 6,000 THB a year.