Someone is lying the question is always who and why,,, and how the he11 can you tell..

So best to do the same as I do at the checkout line at the store, look for the cutest one..

 

I've never trusted them in the past, but the DTE on my 17 Lariat is surprisingly accurate.

 

Last DTE I got on my 32 gallon tank said 819 km (511 mi).

I've also driven my truck till it ran dry cause I was switching from 91 to 94 octane. Got over 50 km on "0 to empty" and I wasn't being gentle with it.

 

Manual states it quite clearly. It is based on the most recent 500 miles driven. So, when you hit 501, it drops mile 1, and so on. When you hit 4,000, it is based on 3,500 - 4,000.

If you drive the same day in and day out, then do a few hundred miles of stop and go city driving, it will read quite different.

Resetting your previous trip odometer and avg MPG has zero impact on DTE.

 

When I fill my 136L tank it says 999kms,and stays that way until around the 3/4 mark.

 

So I take it you never tow anything with a lifetime avg of over 22 mpg?

 

Multiply your indicated mpg number from Screen 1 by the capacity of your tank (on a full fillup) - I'm getting 20+ mpg, 36 gal tank, so 720+ dte on a fill-up. Whatever that number shows is the multiplier for a full tank. .