Acerbis tank is definately 20 litre. Me and a mate got over 26 kpl in Morocco once, fully loaded. We were using the local super (leaded) fuel and taking it steady. The TTR/RE is very sensitive to a heavy right hand, something to do with the 2 stage carb. Once you hit a certain point on the throttle stroke you open the second carb. This is to give you good acceleration for overtaking etc. If you can keep running on the primary stage, you will save fuel.
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