Still having an issue with accuracy with miles left to tank empty, but i'm hoping once i have filled the tank 2 or 3 times then the accuracy will knit in.
This is what the manual says
In order for the TANK information to be useful, you must set the size of
the fuel tank using MORE>SETUP>FUEL>TANK SIZE. When you
fill-up, you must use HOME>MORE>FILLUP>DONE to indicate the
vehicle tank has been refilled. It is also necessary to fill the tank to make
the TO EMPTY information correct.
The estimate of distance and time to empty is based on the economy that
has been obtained so far on this tank of fuel. Right after refueling, these
values will change fairly quickly. As more of the fuel has been burned
from the tank the readings will stabilize.
It is possible to see the distance and time to empty increase as you drive.
The distance can increase as you drive at a steady fuel efficient speed.
This causes the fuel economy for the tank to rise and applying this
higher fuel efficiency to the fuel remaining in the tank can actually result
in more remaining distance. If you drive slower than the average speed
of the tank so far, the time to empty can increase.
You should refill the vehicle when there is above 50 miles/km
remaining. Pushing below 50 could result in running out of fuel.
Pressing the lower left button again will return the selection to the
CURRENT trip. Continuing to press it will cycle the trips from one to
the next. TANK shows different types of information in some cases from
the other trips. TANK substitutes TO EMPTY data in place of
MAXIMUM data.
Be good if the scanguage took the reading from the fuel level sender too, then it would know when it was filled up.