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I would think removing that rear spoiler would help. I've seen alot of Sunfires that color, so you could probably find an entire trunk lid at the junk yard if you didn't want to plug the holes when you were done. Daytime Running Light delete and LED's all around would probably net you another 1mpg or so for just a few dollars. Pump your new tires up to max psi, block the grill like you were planning, synthetic fluid all around, and I'll bet you can return 40mpg with out too much trouble.
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