Instant fuel mileage

gnxtc2 · Jun 18, 2019

Have a 2016 Lariat Ultimate. When I go on long drives, the instant fuel milage reading freezes. The distance to empty works fine just instant fuel mileage freezes. I have to reset it for it to start working again. I have it set to update every 5 minutes. I have not tried other update times.

Is this a common issue with it freezing?

Thanks

Billy T.
[email protected]

tom.boswell.79 · Jun 18, 2019

I don’t have an issue on my 2016 XLT.

PowerStrokePops · Jun 19, 2019

It’s displaying an average for however long it’s been since it was reset. The longer you go the less frequent it changes. If you want to see actual use trip “A” or “B”.

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PowerStrokePops · Jun 19, 2019

What’s actually freezing? The average mileage displayed or the graph bars.

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gnxtc2 · Jun 19, 2019

The vertical green bar graph and the horizontal white box that gives your average mpg for your chosen time. The miles to empty works fine.

Billy T.
[email protected]

PowerStrokePops · Jun 19, 2019

gnxtc2 said:
The vertical green bar graph and the horizontal white box that gives your average mpg for your chosen time. The miles to empty works fine.

Billy T.

[email protected]

That screen doesn’t show the 5 minute increments. So in that screen you’re saying the green vertical graph never goes above or below the white line demarcating 15.2 mpg average?

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gnxtc2 · Jun 20, 2019

The screen image is just for reference. The vertical green bar freezes and the white bar stops moving/giving the avgerage.unless reset.

Billy T.
[email protected]

HeavyAssault · Jun 26, 2019

LOL...You are talking about two different screens. One is the Instant MPG and the other is Fuel History.

Instant may/may not change as often as you think, it depends on your driving.
Fuel History will change based upon your setting (5 Minutes).

Toggle over to the next screen from Instant Fuel to see Fuel History (every 5 minutes).

gnxtc2 · Jun 26, 2019

No, it's on the Fuel Economy screen. If you look at my pic above, you have the green vertical bar graph and the AVG MPG in the square white box. Those two displays freeze on me.

The next screen over changes the fuel history.

Billy T.
[email protected]

HeavyAssault · Jun 26, 2019

Fuel Economy has two screens: Instant MPG and Fuel His (History)

Fuel History allows setting the 5 minute intervals. That setting does nothing on the Instant MPG screen.

IF you reset the Instant MPG screen, it should change within short time driving. For my experiences this will not change rapdily with long drives and consistent driving conditions (i.e. HWY driving). Now if you were to hit a hard long hill, there should be a change....but then as soon as you level off it will find it's happy place again and sit there.

With that out of the way...I'd suggest you switch between the two screens to see if there is really a problem.

I think your driving conditions (not really clear either) are not varying so much to change the display.

Just to check my own experiences I will change to this screen and see what happens while I'm out driving around.

HeavyAssault · Jun 26, 2019

Okay so after driving a bit here's my experience. Using the Instant MPG screen the green bar is what will be most dynamic. It will easily change readings due to operating conditions of the vehicle. Best way I could see the bar changes was while driving along then coming to a full stop. At a Stop the bar would drop to a reading of 0, then once back up to speed limit using Cruise Control the bar will settle where it calculates the "instant" MPG. Now the side bar MPG numbers are not nearly as dynamic as the green bar but they will change while driving.

In short: If the green bar on the Instant MPG screen does not move at all while driving along then coming to a stop I'd agree there's an issue with the display.

Questions? Comments?

gnxtc2 · Jun 26, 2019

HeavyAssault said:
Okay so after driving a bit here's my experience. Using the Instant MPG screen the green bar is what will be most dynamic. It will easily change readings due to operating conditions of the vehicle. Best way I could see the bar changes was while driving along then coming to a full stop. At a Stop the bar would drop to a reading of 0, then once back up to speed limit using Cruise Control the bar will settle where it calculates the "instant" MPG. Now the side bar MPG numbers are not nearly as dynamic as the green bar but they will change while driving.

In short: If the green bar on the Instant MPG screen does not move at all while driving along then coming to a stop I'd agree there's an issue with the display.

Questions? Comments?

Correct....the green bar changes due to engine load, take off, etc, etc. The side bar will settle somewhere depending on the green bar.

After a few minutes of driving on the highway, pulling hills and going downhill, the green bar stops fluctuating and the side bar gets stuck on a whatever was the last number.

Billy T.
[email protected]

HeavyAssault · Jun 26, 2019

Okay...since the green bar stops moving under any condition to include when stopped in traffic I'll agree there's a gremlin twerking in there.

I'll keep watching mine to see if it "settles" over time. I generally don't watch this screen/info as I know more by the trip meter miles driven and fuel gauge info. It's pretty easy for me to get to 500+ miles, have 1/4 tank of fuel left, and drive 70+ MPH.