Should I tip at "full serve" gas stations?

The other day in North America I went through a gas station that offered both self-serve pumps and "full-serve" pumps (someone will fill your tank). I expected to help myself but I accidentally stopped at a pump where someone served me.
I have been wondering after this whether I should tip this employee. If that happens again, what is customary?
Best Answer
I am a gas attendant, in Maine, winters are rough facing negative temps, howling winds and knee deep snow.
No matter what the condition I am always there to pump your gas with a smile!
Whether it be a full tank, 10 gas cans or as little as $1, there is no up charge for the full serve, we are the same price as the self serve stations in town so if you could imagine we get busy!
We don't expect tips, but extremely appreciate it if you do!
But most of all we appreciate a sincere "Thank You" and try not to run over my foot, smash me with your door, drive off, roll my hand up in the window, honk the horn when I'm under the hood, and rolling up the window while I'm having a conversation with you.
Remember we are all human.
And I love talking about the weather, fishing, rippin on the sleds and football season, and anything else that comes up!
If you toss me a buck or two, 9 times out of 10 I'll help someone that comes in and hands me a bunch of change and says "I hope I make it home" I'll toss in $4-5 and say "oops guess that's on me haha" and put my tips in the draw.
We are not all heartless, scum bag, drop outs like we have been portrayed to be.
All I'm trying to get at is a simple "Thanks" and a buck is much much appreciated!
Tip a gas guy please!
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Answer 2
Most of those who work at a Gas Bar that offers full service do appreciate a tip. I work at a Gas Bar in Canada. I get paid minumum wage, there are no breaks when your Gas Bar offers full service and I have no benefits. Every bit helps!
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