I'm trying to adjust my "lie-o-meter" on my gas 2015 F-250. I can access Engineering Test Mode, but I don't see the AFE Bias menu as shown in some other YouTube videos. Is this an option for the 2015 model? I'd like to adjust the bias down from the default 1000 to 951. Thanks!

 

What version instrument cluster does your truck have? Maybe send a picture.

 

I wasn't aware of variations in the type of instrument clusters. If it makes a difference, my truck is a Platinum model.

 

Is this the procedure you're trying?

Engine off. Press and hold OK Button on the left side of the steering Wheel. Turn the ignition on Accessory mode only. Do not turn The Engine on. Hold for about 5 sec until "Engineering Test Mode" appears. Turn the Engine on and go through the menu pressing and releasing OK Button. When "AFE Bias 1000" appears press and release Down. Using Left and Right change 1000 to the Number You calculated. Press OK. Actually the steps how to correct the Numbers appears on the screen once You reach AFE Bias. To leave Engineering Mode after You are done just turn the engine off.

 

No. I tried the OK button technique and couldn't access the Engineering and Test Mode. Another video I saw said to hold down the "down arrow" below the OK button and turn on the ignition accessory switch, and that did get the Engineering and Test Mode screen to display. However, as I toggled through the menu I didn't see a "AFE Bias" topic in the range of options. Other comments in videos suggested that it might not be available in the 2015 series SuperDuty, and I posted this in hopes that either that is in error, or that the AFE Bias might be accessed in a different way. Thanks for your interest.

 

OK, I can now answer my own question. I went to a Ford dealer today to take advantage of their "The Works" oil change service and an antifreeze flush, and while I was there I asked them if they could reset the AFE Bias for me. As it turns out, on the 2015 year model (and I would assume earlier) the AFE Bias is accessed only through hooking up their computers and reprogramming. I asked "how much" and they said they'd charge an hour of labor at $140/ hr. I said "no thanks." I've lived with the Lie-O-Meter as is for seven years, and I can just continue to do my own mileage calculations.

 

Help me out here...
What is the "AFE Bias"?
I'm assuming AFE is "Average Fuel Economy"

 

Yes, that's what I assume it means. The fuel economy display on the instrument panel is notoriously inaccurate. From the factory the bias is set at "1000." If you hand calculate your mileage over several fill ups and calculate the accuracy the AFE bias can be reset to reflect what actual mileage you are getting. In my case, I was actually getting 95.1% of what the truck was calculating, hence if I downgrade the AFE bias from 1000 (100%) down to 951 (95.1%) the instrument mileage shown should be very close to actual MPG.