[TimV]

As mentioned above. Keep the rpm in the torque band. I think for you it is better to keep rpm between 1800 and 2600 during acceleration. I think you need to go a little higher in rpm before you shift. You lose the benefit of the spooling turbo if youre rpm drops below 1600rpm.

While cruising. Keep it in highest gear possible without lugging the engine.

Do some aero modifications. Pump up tire pressure to max sidewall or little above.

Drive slower in the highway. 100km/h should give you a bonus of around 0.5l/100km!

Try puls ald glide. But this depends on vehicle to vehicle if it works or not