2018 computer showing empty fuel tank too early

OP here. This last tank I took to empty, 0 miles left, and squeezed in 15.5 gallons, 350 miles. 3.5 gallon reserve is about 75 miles I guess. So if you drive 15000 miles a year, that is 7 extra fill ups.
 
Just filled up the other day. Drove it till the gas light came on, which is when the range showed 30 miles (same as my cx5).

386 miles, 15.8 gallons = ~24mpg

I have a fwd, so fuel tank is 19 gallons. When the fuel light comes on, that's a little over 3 gallons in reserve for me, which is also about 70 miles in reserve at my mpg's.
 
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