Cash for clunkers, what a waste.

Is your monthly gasoline bill going to be more or less if you trade the truck in for a new car payment and insurance?

I work out of state, almost 650 miles one way from my house. I have to drive it 2 times a month. I spend about $ 375/400 a month in fuel at the least. I guess I could move but i dont want to live in Loiusana. I will weigh out my options about the truck.