Well you also have to keep in mind that gas varies from area to area but I'll round to a general price of about 3.50$.
1,545 miles at 18 miles to the gallon would be about... 85-86 gallons.
so you'd probably need around a bare minimum of 300$ discluding rest stops, motel, food, water, ect.
However JUST to be sure, I might make it 320$-ish