1. South Carolina - $2.77
2. Tennessee - $2.78
3. Mississippi - $2.80
4. Virginia - $2.81
5. Missouri - $2.82
Those prices mean you'd need just under $45 to fill up your SUV, assuming the average SUV holds about 16 gallons.
As for the priciest states, Hawaii and Alaska ding your wallets worst, with gas running $4(!!) per gallon in the Aloha State and $3.74 in the Last Frontier -- not to be confused with the Final Frontier, since the Starship Enterprise runs on deuterium fusion reactors and not gasoline.
New York ($3.40), Connecticut ($3.57), and Wyoming ($3.30) are all pretty bad, too.