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it's full synthetic Castrol edge oil - 0w20

Well, I may be calculating it wrong, but before the oil change, my gas tank would only go down 1/12 of a tank when driving to work. Today, it went down more than 1/8 of a tank by the time I got to work.

I changed the oil in my 2012 corolla roughly two weeks ago, and ever since, my MPG significantly changed. I used to get around 30-35 mpg and now I get roughly around 20 MPG or even less. Is there any way the oil change could have caused this? could there be something else going on with my...