Gas tank

[FireRescueMi]

I want to change the fuel tank on my 82 GS1100GL with one from the same year 1100 G or GK. I would like more riding distance between fuel stops. I currently am getting 40 mpg out of the bike but only get 120 miles before I have to use reserve and then fuel. I get about 170-190 out of my 81 GS850G @ 33-35 mpg. I thought I read in the posts that this change wouldn't work but could not find it again and wondered why? Any help will be greatful. I can get a really desent used tank @ a local savage yard for about 60 bucks with gauge & petcock so the swap should be pretty cheap. thanks for your time and input.
Greg 8)

[daveo]

you May be able to make it work if you weld on the mounting points for the GK tank...the 2 frames are different though, so it's not a direct swap

[FireRescueMi]

gas tank

It figures that it wouldn't be easy and that the frames were different. thanks. I assume that this also applies to th e"G" modle as well? 8)

[daveo]

I like to think of it as the 'L' being the oddball, it's different than all the others, lowered cutout for seat

[bgk]

Simply ride your GL to the salvage yard, pull your tank off, and try to "dry-fit" the other tank in place, while you're in the parking lot.

That'll tell you everything you need to know, without having to rely on someone else's well-intentioned good guesses.