A new vehicle

I have a 1999 Dodge Dakota Sport and it is a V6. It eat up the gas that I put in it. If I fill the gas tank up to full, in about 3 day the tank is empty. I use this truck to go to college (8.5 miles from my house) and back twice a week, and to go to my mom's house (20.3 miles from my house) and back once or twice a week. I'm a college student and I really don't have then money to fill my truck up every three days. So I have been wondering about getting a hybrid or economical vehicle. I have tell to a mechanic about both types of vehicles and he say to go with a Honda Civic. I was thinking about getting a Scion Tc or a Nissan Altima Hybrid since that have good mileage. I will to get a second opinion on a vehicle.