OBD2 not reporting as much fuel?

[454cid]

I filled up yesterday, and again today at a different pump, and the 850OBD2 app isn't reporting as much fuel as it typically reports. The owners manual say the capacity is 19 gallons, but the highest ever reported by the app is 18.x and there is two amounts....maybe one includes a reserve, after the fuel light comes on? Sometimes they agree and sometimes not. However the last two times I've filled up, I'm only seeing 17.x gallons. Today both were 17.3 and the dash gauge was right at 18..... I think the needle has been slightly above before, but am not completely sure on that.

I'm going to see if I can get more in at another gas station..... maybe the pumps were recently calibrated differently for shutoff?

Failing that, I'd wonder if the fuel level sender is starting to go out.

I don't know how many of you monitor your gas with with the app, but have you ever had level sensor that started to loose it's top end?

[abscate]

I don’t recall ever seeing a 19 gallon capacity but I live in s/V70 world …