Gas prices

Gas seemed to go up enormously since I got my last tank.  I used my phone to check a website and saw that the cheapest gas was near my house at $3.12.  At the time I was low on gas and on the other side of town.  I risked running out of gas to save $.07 per gallon, but when I pulled into the gas station near my home, I saw that the price was actually $3.19 and not $3.12 as listed on the website.