Riddle me This Batman

[Houston Kid]

I got my 2018 to work before. Here is how I did it:
Turn on the key but do not start the car. (press "Start button")
Put the display in the mode where it is blank.
Hold the "OK" key and start the car.
When the "Engineering Test Mode" shows up release the "OK" button.
Use the up/down arrows until the AFE Bias shows up.
Press the "OK" key and then use the up/down buttons to adjust the Bias.
When you have what you want then hit the "OK" button to save it and you're done.
That is what I remember. If it doesn't work, don't shoot me. I'm just the messenger.

Damn, had to put the large Cowboy shit kickers on to wade through this thread... LMAO!

So curious, do any of you venture beyond this little GT500 nook of the forum?

Most likely the OP might need to adjust the AFE Bias calibration of the cluster. It's been discussed on here elsewhere as others have found that the S550 MPG readings are not accurate or in some instances not being calculated correctly in both the Analog and Digital clusters. One can confirm this if they did the old fashioned MPG pencil to paper (or Excel sheet) math.

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To adjust the AFE Bias, you first need to access Engineering Mode; the below links demo how to access EM.

If you have a 2015-2020 with the ANALOG gauge cluster, you should be able to enter the “Engineer Test Mode”.

Follow this link:
https://www.mustang6g.com/forums/threads/engineering-test-mode.27581/

If you you have a 2018-2020 with the DIGITAL cluster, you should be able to access the same test mode found here:
https://www.mustang6g.com/forums/th...n-18-digital-dash-old-way-doesnt-work.115231/

For those that also don't know, Engineering Mode also has the ability to get any stored DTC's...

Now back to our program....

To understand how to adjust the AFE Bias once in Engineering mode, go to this informational thread (starts off with Analog cluster):
https://www.mustang6g.com/forums/threads/how-to-adjust-your-indicated-average-fuel-economy.48903/

To do the same AFE Bias adj. in the Digital Cluster, hit this portion of the thread:
https://www.mustang6g.com/forums/th...dash-old-way-doesnt-work.115231/#post-2425775

Additional thread regarding the AFE Bias:
https://www.mustang6g.com/forums/threads/mpg-display-correction-adjustment-afe-bias.99044/

Hope that helps the OP.

Cheers!

That is some great info. So a calibration with out FORScan.
I am going to see if that works tonight when I get home. Meaning if you can even get into the AFE that is.

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