I had that with mine aswell. I had less than 1/4 tank left & the DTE was 300 miles
Does the fuel level still show the right thing? I'm sure mine used to go up and down if you booted it for a bit and then went back to driving sedately, somehow being linked to fuel usage. So if it thinks you are using sod all, it could say you have loads of fuel left when really you have nothing
It showed permanently empty
Was a lot of fun judging fuel levels when I had no centre gauges & had to rely on the fuel gauge