Hi Johann,
What kind of input are you looking for?
I've used an Acerbis 20l tank and an 18l tank on my current DR650, not sure but possibly IMS? I've also tried a 30l Safari tank but that made my lowered DR very front/top heavy.
Recently on a ride, chasing after a bunch of big KTMs and BMWs, I managed about 300km on the 18.5l tank before I had to switch to reserve. Put in 16l, so just under 3l reserve on that. I think my 20l tank held about 2l reserve.
The better range gives you more freedom, and if you ride at a slower speed of course you'll have a better range.
If you want to know about installation or other technical, chat to
@Dux.
If you want to know where to get a tank, best chance is import, although someone might have something lying around.
Get one - best farkle for a DR650
