another tipping question: gas stations in NJ

[mikech]

ok, i've seen a number of posts in the past discussing tipping (or not) in various situations; i haven't seen this issue addressed so i'm asking about it, if it's been mentioned before i apologize.

typically, when i get gas i always use self-serve pumps, since it's a lot more expensive for full-serve. the problem, however, is that in the state of nj ALL pumps at ALL gas stations are full-serve, by law. i think i've read somewhere that this is also the case in oregon, i'm not sure. anyway, i drive to atlantic city on a pretty regular basis, so i often have to fill up on gas in jersey.

my question is: given that i have no choice of pumping my own gas there, is there an expectation that i tip the attendant? i assume that he gets paid an hourly wage for his job, is that correct? if i'm supposed to tip, how much should i tip?