Q: What is causing the massive loss in mpg?

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I own a 2010 Chevy Cobalt, 2.2l Ecotec 5 speed manual. Bought it used with 73k miles on it. I've been driving highway since Monday on a full tank of gas, reset my mpg average. The car is rated 37 highway, and my on board dash mpg average is at 31 mpg. The car is running fine, a tune up might be due but that couldn't possible cause a 5+ mpg loss. Any suggestions? Ran my code reader and nothing coming up or stored, car. Seems to be running just fine. No issues anywhere

My car has 73000 miles.
My car has a manual transmission.

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