How can I improve gas mileage on a Chevy Trailblazer?
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There are a few good options to improve mileage a fair bit. There is a lot of stuff to read and most questions on the forum get answered really fast.
You will want to read about K&N intakes and a "TUNED" PCM. The exhaust on these trucks is very free flowing and has only enough restriction to make the VVT work properly.
You can try a fuel catalyst. If you google, "how to improve gas mileage" you'll find a bunch of suggestions. I'm trying a product called Fuel Infusion (http://www.fuelinfusion.com) right now and seeing between 10-15% better mileage. There's lots of things to try, but this might be a good product to test.