Thanks for all the replies folks, nice response! If the 650gs can achieve 70-75mpg i will be very tempted by that, but will need to work on my figures as mentioned since £1000 would cover a lot of fuel if i bought an older cheaper bike. I keep forgetting about the varadero 125, it will definitely be short listed!
I had considered doing a trip on a bicycle or a dual sport, so the logical step was a low capacity motorbike as a compromise between the two. I had intended in spending most of my time in places like Mongolia and eastern Russia so will need to find out how much fuel actually is there. If its peanuts by comparison to the UK then the saving will be smaller using a small bike like said.
Cheers again folks, much appreciated
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