Just a bit of useless information.
Covered 300km on Saturday riding my XTZ and met up with a group ride after 50km. Mostly twisty dirt roads using the corner marker system over 6 hours.
When we refuelled both my XTZ and a fellows XTX had used 13.5 lts.
Not to shabby hey for 300km. Ok we weren't breaking and speed records but we were loaded for an overnighter. I was riding sweep which did go in my favour. My XTZ in need of a valve adjustment and an oil change with 45k km and his XTX with a mere 4k km and we used exactly them amount of fuel.
They just keep on chuggin.

nice trip you had! it's not bad consumption for that mileage

Nice pics well done!!!!

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(Now sold on, sob) 2011 Blue XT660X with gold wheels, was 26,500 km.
Engine mods: K&N Stage 1 filter, DNA Stage 2 filter, snorkel removed, Kev fuel mod fitted.
Plus: smoked Puig screen, Yam aluminium sump guard, Yamaha / Acerbis handguards, Givi Trekker aluminium side cases, Leo Vince X3 cans plus Kev front fork mod and Fender Xtender. Just fitted Michelin Road Pilot 3 tyres.

SOLD the XTX for a Super Ten 1200. And just bought a Raptor 700 so staying on here for some tips....

Riding lovely Spanish A roads at a steady pace I managed 69mpg. I checked this from miles travelled against amount of fuel to fill up to the lip, so not 100% accurate. But was filling up at around the 270-280 miles travelled mark.