The two main problems are:
-Fuel sender
-Injector size
The fuel sender seems to be pretty spotty, had mine replaced once and it fixed it for awhile but came back now & again. The injector size is causing problems with MPG/Miles to empty/bottom dots. The system is expecting the injectors to run a certain way but with larger injectors they pump more fuel but less often causing the system to think it is running more efficiently. This is not an ECU issues it is another system in the Z which measure MPG/Range and needs to be adjusted so the dots & read outs can properly show.
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