It is as low as $2.98 in San Antonio. Canada this summer we saw prices as high as $5.77 a gallon. It was crazy. Chicago was $4.29 and as we worked our way back to Mexico it dropped down to $3.16 average.
There are intersections in McAllen, Tx with a gas station on all four corners and the prices are all different. For example, some people think Shell is better quality, some pay with a Chevron credit card because they don't have any money, others are like me, whatever is the cheapest. Thanks GasBuddy!