In the interest of saving a buck (and who doesn't, these days?), I thought I would post this interesting map of Houston showing the gas prices.
I'm not sure if the map will provide real time prices once posted, but I think it will because apparently it will take you to their website.
Once there, you might want to book mark it.
As you can see, there is quite a widespread in the price of the same product.
Scan the list, if you happen to be in a low price area, then fill up your tank.
Maybe, save a few bucks in the process.
http://www.khou.com/traffic/gas-prices