Mate, I don't know about the sand fuel economy as my sand riding has been limited. But off road here in Oz through some sand, bull dust, dirt & gravel I still get my average of 16km per litre @ 100-110 kmph.
ACERBIS do the larger tank for the Dommie. Ostensibly they advertise it as a 23 litre jobbie. But my black one has expanded over it's 18month life & now holds 26 litre.
I paid DM450.00 (EUR225) for a new one.
Cheers. Graeme
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