I hope your mileage has improved, it seems like it has. I only get about 31 MPG in my '04 Aveo, and it's all highway driving with little stop and go traffic. Mine is a 5 speed sedan, and I thought when I got it I would get better mileage also, but it just doesn't happen. I had a 3 cylinder Metro for several years and it honestly got about 42 MPG. Not to be nosy, but if you don't mind sharing, what is the approx. cost to have the timing belt replaced? Thank You. I have had mine done two times and I think I paid too much to have it done, but not sure since I don't personally know any other Aveo owners.