I hate stopping for fuel when touring in Europe,I put an Adventure tank on my 1150 which meant refuelling at 320 plus miles rather than a 170 miles maximum , because of this when I replaced the 1150 I bought a r1200gsa and then it was replaced with a r1200gsa lc .
It makes a huge difference even if you are just commuting or out for a run locally..........I went out on my gsx1100 katana around the Scottish borders and had to fill up twice due to the 120 mile range .
I did originally look into having a standard 1150 tank modified or have an aluminium tank made. The latter was prohibitively expensive and the former having seen the results of a couple of tanks didn't look right.