I compared the price from Vancouver BC to Seattle WA and was surprised to say that food was cheaper in Vancouver, as Vancouverites are always coming south of the border to buy their groceries. Especially milk, which they load up on by the cart full. On this site though it says a liter of milk in Vancouver is $1.65 and a litre in the US is $2.90, a GALLON in the US can be bought for less than $2.90.
So I'm a little suspect of the data.
I may be biased in my priorities, but a 6-pack of decent beer costs $7-$8 USD in Washington and about $15-$16 CAD. Exchange rates are still nearly at parity. I find myself bringing a case to support the drinking habits of my Canadian friends every time I drive up... (No wonder they like it when I show up.)
Numbeo gives 0.90 for a liter of milk in Seattle http://www.numbeo.com/cost-of-living/city_result.jsp?country...
Cost of living in London is 16% more expensive than in New York City
Cost of living in New York City is 14% cheaper than in London
120 is 20% higher than 100
100 is 16.(6)% lower than 120