I'm not sure where they got their data from, but one thing stood out to me.
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.
This is very consistent with my experience shopping in Van and Seattle... Meat, produce, dairy, and alcohol are all exceptionally more expensive than Stateside.
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.)
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.