I done 3200 miles on my 2007 blade same this year on my 12 never struggled for juice even in Pyrenees etc
Are you touring alone or with pillion? Reason I. Ask is if your alone an Auxiliary tank fitted over back seat and tapped into main tank is a damn sight cheeper. I had a tank made in the USA if you want Jaxons details let me know but it costs this is his work The Wandering Waltons: The XT1200Z Tank Conversion Project - Part 2 I bought a brand new tank on USA eBay and shipped it straight to him. I wanted to retain original shape which he did 100%
I just found filling up once every 350 miles made life easier on big rides. Rochdale to Dover on one tank job done. I still have no idea what range my bike does but still having a ball. At least it's not 125 miles like the 675 was. Now that really was mind blowing LOL
I prefer Baron von Grumbles take on this. He just carries a 2 litre Robinsons Squash Bottle filled with unleaded and just tops the tank up if needed. Simpleeeesss!
Those Japanese tanks are very nice, but at around £1800 are pricey, also 2 month lead time from order to delivery !! I noticed too that after July 31 they won't be exporting any more due to new regulations ! I reckon a good scour of the UK will unearth a craftsman who could make a bespoke tank. Maybe a look into the regulations regarding tank materials could open up the options