In Germany, the speed limit on secondary roads is 100km/h and in most countries it is 90 km/h. I would recommend a bike that can do at least an easy 100km/h going uphill so no less than a 400cc.
The fuel consumption depends for a big part on your right hand. On my +/- 3000 km trip to the Czech Republic my 1200cc Honda GoldWing used 44 mile/gallon (18 km/liter) on average and I can assure you that it is much more comfortable then a 125 cc commuter bike.
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Jan Krijtenburg
My bikes are a Honda GoldWing GL1200 and a Harley-Davidson FXD Dyna Super Glide
My personal homepage with trip reports: https://www.krijtenburg.nl/
YouTube channel (that I do together with one of my sons): motormobilist.nl
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