I think Hamilton has been the farthest I went, but that was not my gas bill
I have to consider time on the road and gas when it comes to cost when shopping. Driving to London, 2 hours round trip on the road and $30 in gas is not that tempting to save a few bucks on used items. Even a good tank deal, say 150$ in London as example, when I can get the same one for $200 locally, I would get it locally. Basically the price has to outway the cost IMHO. I typically will travel 30 minutes to meet if I have to. I have met in Chatham, Comber (recently for a frag trade), used to go to Highgate sometimes, but that is about as far as I go when I am fronting the gas bill.