Why does the Chevy Volt in Canada go farther than the Chevy Volt in the US?

Question

In the US the commercials say it goes 35Miles on a single charge but in Canada I saw a commercial that said it went as far as you want?

The reason I ask is that when I saw the movie "Who killed the electric car" the told about a battery that who patent was purchased by the gas companies that went 300 miles on a charge. I wonder if this was the battery and if the patent they purchased was only for the US?