In previous years, gasoline was less expensive in the United States than in Canada, but now, due

Question:

In previous years, gasoline was less expensive in the United States than in Canada, but now, due to a change in taxes, gasoline costs less in Canada than in the United States. How will the gasoline-purchasing behavior of a Canadian who lives near the border and can easily buy gasoline in either country change? Your answer should include an indifference curve budget line diagram.