How should I best pay off my car?

I bought a car in September for $15,000 at 5.15% and was looking to refinance it at my local credit union. I've paid close to $6,000 with $9,250 left. I have great credit and am available to refinance at 1.5% for 36 months or 2.5% for 48 months. My original car payments were 244. At the 36 months rate I would pay $263, and for 48 months I would pay $203. It about two car payment worth of interest.

I also have about $2500 (my unofficial 5 month emergency fund) that I could dump into the loan and significantly lower my payments. To about 203 for the 36 month rate. I'm a university student making good money as a servers and am about to graduate in May. I'm not positive about what I'm going to do after school other than going back to my parents and looking for a local Comp Sci or IT position. I like the 48 month term a little better because that would make my emergency fund last a little longer if something happens.

Do you guys think I'm set with my decisions here?

edit: My payments are 244.18 for 72 months at 5.12% but I am already at the " 39% maturity rate" on it's 6th month of loan because of heavy over paying on the principle.