HOW TO CALIBRATE YOUR LIE-O-METER
I keep hearing people complain about how far off their mpg display is. They always express frustration - as if it's Ford's fault and some sort of grand conspiracy.
It's not.
The mpg display is simply a calculation based on miles traveled divided by fuel used. Math doesn't lie... So if it's inaccurate, then one (or both) of the pieces of info it's getting is wrong. Usually it's the miles traveled, because people commonly change tire size without telling the mpg display... And since the truck calculates distance based on tire rotations, any change in tire brand, model, pressure, or size is going to change that reading.
Here's the short version of how to do that with any Ford vehicle made in the past decade or two:
1. Use a GPS (Waze, Google Maps, any speedometer app) to figure out how far your speedometer is off. Set the speedo to 60 and record what your GPS says.
2. Download Forscan from Forscan.org. It'll require an OBDII reader ($50 Amazon), a Windows-based laptop, and some reading on how to operate. If you can't do this, get a friend to.
3. Open box 726-12-01 in the BdyCM tab and write down the alphanumeric digits in the middle field.
4. Reply to this post with your two speeds and the alphanumeric digits.
5. I will send you back new alphanumeric digits to put in that field. Save/write them to the truck's system.
6. Enjoy an accurate speedo, odometer, and truth-o-meter.
If your truth-o-meter is still incorrect, then shoot me a PM and we'll calibrate your fuel tank size as well. FWIW, 2011-2016 long beds have a 37.5 gallon tank, not a 35 gallon tank... So if you've changed that with EZ Lynk, you may want to change it back.
PFA.
