I rent wet, there are two bases now, the original has very expensive fuel, so if I'm able, I return the airplane fueled, which is near or just above tabs. I don't go out of my way to do this, but if I'm near gas and it won't cost me hobbs time, I'll do it. The second location, which I also use, has cheap gas. So I won't gas it up unless I need to, because the obviously, the fuel there is cheaper than most other places.
I figure the planes I rent are on leaseback, so the owners pay for fuel. If I save them money, they make more on airplane and hopefully are able to keep rent increases down.