Gas Price Comparison U.S. vs. Canada
This simple formula allows easy comparison: Multiply the U.S. price by ..275 to get the per liter cost in U.S. dollars. (calculated by dividing the number of ounces in a liter (35.2) by the number of ounces in a U.S. gallon. 35.2 ÷ 128 = .275 A U.S. gallon is smaller (128 oz) than a Canadian gallon (160 oz).
Example: using the formula: $4.04 per gallon at the pumps in the U.S. x's ..275 = 1.11 cents per liter. The figure is in U.S. dollars so multiply the number by the current exchange rate.
Canadians visiting the U.S., record the average gas price per liter in Canada and perform the following calculation: Divide the average Canadian price per liter by 35.2 = price per ounce. Multiply that by 128 = cost in Canadian dollars per US gallon. Convert that to U.S. dollars by multiplying by the going exchange rate. Post that number on your dashboard for the trip, the price that you would have to see at the pumps in the States to be paying the equivalent to Canadian prices. If you buy gas for less than that price, you are saving money.
For example, if paying an average of $1.32.6 Canadian per liter in Ontario and the exchange rate on our dollar today is 1.01, if crossing the border today you would do this calculation.
 Divide $1.36 by 35.2 = .0377
 Multiply by 128 = $4.83
 Multiply by 1.01 = $4.87
Whenever you pay less than that amount per gallon, (almost always), you save money. Check gasbuddy.com for today's average price in the U.S. (U.S. $4.04 per gallon), while the average price in Canada is Can $1.32.6 per liter. So buying gas today at the average price in Canada costs $1.32.6 per liter. Using the formula, I easily calculate that the same liter amount at today's average price in the U.S. costs US $1.11 cents converted to Canadian = 1.01 that's $1.12 cents per liter, a difference of 20.5 cents per liter! In other words, gas in the U.S. is 20% cheaper than in Canada.

