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omar302

Fix the inaccurate MPG display in 2 minutes!

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Ok, so I read this post on the F-150 forums and found out that the AFE can also be changed on my Edge. Still didn't try it as I need to calculate the actual mileage for several fill ups to calculate the AFE value.

 

From the F150forums:

The LOM is known to be pretty inaccurate for most of us. The good news is that you can fix it quickly and easily in 2 minutes with no tools if you know roughly how far off it normally is...
This was posted on another forum, but I thought it was too helpful not to share. Note, I used it for the 8" display size and it worked perfectly. I modified the procedure to be more clear than what was posted on the other forum. I have not tried the 4.2" display procedure because I don't have that one. I did this and my next fillup was accurate to within 0.1mpg.

FIST!!
Take your hand calculated MPG and divide it by the LOM display MPG....then multiply by 1000. This new number is what you will change the AFE Bias to.
Mine worked out to be 934 because my hand calculation was 18.3mpg and my LOM said 19.6mpg. Example: 18.3/19.6 = .9337xxxx. Multiply by 1000 gave me 934 (I rounded up) as the number to use.

For Lariat and up 8 inch Display:

Engine off.
1. Press and hold OK Button on the left side of the steering wheel and don't release it until the end.
2. Press push start Button only (Not Brake Pedal) to turn to Accessory Mode.
3. Once Message “Accessory Mode” appears.... press the Brake Pedal and turn the Engine on.
4. Engineering Test Mode appears instantly. Release OK button.
5. Scroll to AFE Bias and push OK to change it to the number you calculated. Note, it takes quite a few clicks to get to AFE Bias.
6. Once done, turn off truck and it will update your mpg, including your Trip 1 and Trip 2. You'll see it has changed the next time you start the truck.

Note....quite a few of us have been successful just holding down the OK button, starting the truck, then releasing the OK button once Engineering Mode pops up.

For 4.2 inch Display:
Engine off.
Press and hold OK Button on the left side of the steering Wheel.
Continue holding OK button and start the engine...don't let go of OK button until "Engineering Test Mode" appears.
Go through the menu pressing and releasing OK Button until you reach "AFE Bias 1000" appears.
Press and release Down. Using Left and Right change 1000 to the Number You calculated. Press OK.
To leave Engineering Mode after you are done, just turn the engine off.

 

 

LOM = Lie-O-Meter, they mean it is the MPG readout. For my Edge, to Engineering Test mode I followed the Lariat and up 8" procedure.

 

 

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My F150 was similarly optimistic initially, showing 21.3 but manually calculated 19.7 (e.g.). However - the last tank I checked was the opposite - manual was actually higher than the computer. So I need to do some more testing. Might have been operator error.

 

Either way not sure it's worth changing for such a small difference.

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On 9/17/2018 at 8:49 AM, akirby said:

My F150 was similarly optimistic initially, showing 21.3 but manually calculated 19.7 (e.g.). However - the last tank I checked was the opposite - manual was actually higher than the computer. So I need to do some more testing. Might have been operator error.

 

Either way not sure it's worth changing for such a small difference.

 

So have you got it worked out now for the Edge ST? Thanks, 

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Sorry, was reading the other post and thought it was the author of the way to do it. Worth a try, can always set it back to what they had it on. So if I understand correctly, I should compare the next fill up and mpg from it and then do the math with the LOM....glad you explained what that was, LOL

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9 minutes ago, EdgeST said:

So if I understand correctly, I should compare the next fill up and mpg from it and then do the math with the LOM...

 

It is better to get an average of at least three fill ups to have a better base line. A calculated mpg from a single fill might be off due to over or under filling.

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Ok, so take the average on both sides, the Fuelly and the LOM, correct? Thanks again for posting this.

 

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Yes. Average on both sides.

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