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The OBC tends to be less accurate than brim to brim measurements in my experience. You can go into the menu and change the OBC calibration so it more closely matches brim to brim measurements though.
You could if you wanted use the correction factor in the hidden menu to make the quoted MPG the same as the actual MPG.
Here's how:
1. Hold down the odometer reset button and turn the ignition on by pushing start/stop button.
2. Release the odometer reset button, and you should see a menu of 4 items on the dashboard. From here on, use the odo-reset button to advance to the next entry through a short press, and to select through a long press.
3. Choose the one that says Unlock through the above, which will take you to a passkey screen. Your passkey is the sum of the last 5 digits of your VIN. Increment the two-digit number until you get to it, and with the long press of the odo button, select it.
4.then scroll down to correction factor and modify it from 1000 to whatever you require, mine is at 964 and it's now almost spot on every fill up.
Standard factor is 1000 going up above 1000 reduces the mpg on the dash, below 1000 increases the mpg reading.
I got this from someone else but it worked for me. The OBC on mine was 5 - 7% optimistic, so I changed it from the default setting of 1000 up to 1060 (so -6%) and now the OBC is rarely more than 1% away from the brim to brim measurement.
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