This morning I was doing a little exploring on the internet while looking for the cheapest gas to fill up the car. There are several resources available which may help you as well.
Here are a few that I found:
Gasbuddy.com (by state and province):
Internet Auto Guide (cheap gas near you):
GetMobio (cheap gas prices on your cell phone):
Motor Trend (cheap gas prices):
Fuel Economy (government website on gas prices):
I hope this helps!