MPG discrepancy

sharkielsharkiel Member Posts: 1
edited June 2016 in Hyundai
I'm wondering if anyone can help me with this.. When I fill my gas tank, and drive out of the gas station, the MPG shows me getting 2 MPG, or there abouts, and it very gradually, over the course of a couple of days, gets higher and higher... today, after 2 days of driving about 40 miles each day, it is showing 20mpg.....so I never really get a true reading of what kind of mileage I get.. Any ideas?
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