'Fuel range' indicator is wrong by hundreds of miles.

[earlman]

I fill up the car with gas. The normal gas gauge reads fine, consistently.
Then I click it to 'fuel range,' and with a full tank, it says I only have 114 miles to empty
when actually it should read at least 100 miles more.
Now, I know there are factors that can change the fuel range numbers dramatically, so I monitored it for about 2 weeks,
and it's just way off no matter what I do. Any ideas? Thanks!!

05 Limited (on it's way out)
03 Custom (garage queen)

 

[Homer Jay]

Was it calculating correctly and then stopped?
Out of curiosity, what are the average and instant MPG readings?
It should reset automatically, but wonder if resetting the avg MPG would recalculate the fuel range
It's still possible to be a faulty gas sending unit, have you ever run the tank to less than 1/4 full and then fill up to check for accuracy?

 

[earlman]

It was just fine. Recently drove it 1,800 miles cross-country on 93 octane to 'blow out the pipes.'

The average and instant MPG readings all read correctly going off of what my 05 does.

I've filled at 1/4 tank, 1/2 tank. Ran it highway, city, let it idle, not let it idle, etc.

'Fuel range' estimator is now consistently off by 100-150 miles.

 

[earlman]

New (different) problem. Maybe related? The stock radio will not store any preset stations.