According to the Canadian Taxpayers Federation, the federal carbon tax adds 11 cents per litre for gasoline. This means that if the tax is dropped, you could save 11 cents for every litre of gasoline you buy. For example, if you fill up a 50-litre tank, you could save $5.50. However, this is only an estimate, and the actual savings may vary depending on other factors, such as provincial taxes, market prices, and regional differences.