I am using this site for last six months and me finding info very correct. Tomorrow's prices are usually posted between and each day. Here following Canadian cities are covered
Guelph-Cambridge
Kitchener-Waterloo
Toronto-GTA
Every body can use this site and save money. You can also sign up for email alert.
Here is link for more info Save Your Dollars with Tomorrows gas price today
Nice website to save money on gas before you filling up