Mystery autonomy and tank capacity

[Wonder]

Hello,
no no I only use one foot,
the fact that the problem appeared when I ran out of petrol (according to the on-board computer I no longer had autonomy and the fuel gauge was at 0) even if in reality there was a few liters (as I had told at the beginning of the post)
With the full tank that I had made, the consumption indications immediately appeared abnormal (even if the machine was fine it had no problems and no lights on) so I thought maybe it is some sensor that needs to be re-calibrated but that in reality the machine was consuming regularly, instead, the bitter surprise 6.1l / 100km (15l / km).
Now with the new fuel consumption "seem" normal from 4.3 l to 5.2 l / 100 km

Think that the spot is 1 year old and less than 5000 km

However, such a change in consumption after having had a problem with petrol seems strange to me.
Now let's see how it goes with this full

[guest9814]

This happens to me to, but watt’s I see is dropping of timing advance through car scanner and short fuel trimm plays to add more fuel
On instruments panel I see that after topping up tank and let’s say computer optimist’s write  that I can do on this tank 1070km after driving 15 km  like grandpa with already heated up engine it’s changing from 1070km to 980km
Strange…..
Watt’s that can be…..

[Wonder]

Hello,
you are very lucky,
at the first full I had an estimate of about 1040 km from the computer (if I remember correctly) and then it has always been a decline,
the last 3 full ones gave these mileage estimates
736 km (but in reality it has become 597 km)
689 km (but in reality it has become 580 km)
now with the last full the estimate is 651 km.
In my opinion, as estimates and as consumption we are not really there,
let's go and see what turns out now

[nowster]

It's taken me this long to work out that "autonomy" here means "range".