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My girlfriend has the same engine/transmission in her 1999 Sunfire sedan. It's just awful with that 3 speed. I had to drive it to work for a week (500 miles) and the best I could do driving 60 MPH was 26 MPG. She is lucky to get 24 MPG doing mixed driving.
I'm not sure how effective aero mods will be in such a short and slower commute, but thats where I would start (unless I had the option to sell the car and buy another one!). You've already pumped up the tires. Maybe try some engine on P&G in neutral?
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