So if the total is $3.10, and you pay with a $5, you throw away $0,90? That is definitely an American mentality. 2 Euro and 2 pound coins can add up very quickly.

A 2 Euro coin is almost identical in size to a Canadian toonie and a 2 pound coin (anywhere from 25 to 28 mm). They're all similar in look and size, so how can one say that the UK 'does it best'?!

Back to tipping, I'm certainly not about to freely give away my coins as a tip. I do like the McDonalds charity option as it is voluntary, but the whole mentality of coins being too difficult just astounds me. You're tipping people as a convenience to yourselves, for having provided no real service.