Inverter pump failure- aftermath?

Usually a semiconductor acts in a binary function: it either works or it doesn't. So if your car becomes READY and there are no warning lights, I would look elsewhere for the reason for an mpg decline.

Also, having mpg low with one tank is not enough to be worried. Who knows, you might have been shortchanged at the pump, the energy content of the fuel might be below normal, etc.

 

[mis-information deleted]

 

Does Phoenix switch to a winter fuel blend right about now?

 

What was that news I recently heard? Something about the gas expanding in underground tanks when temps outside become high, thereby making pumps indicate more fuel was pumped than what actually flowed into tank.

 

Even if the little processors on the inverter electronics module
are flash-based, I seriously doubt a dealer has any way to reload
them. Main ECUs, yes, something as embedded as that, no. I
spotted nothing that looks like a programming interface on the
control board.
.
_H*

 

I think it is possible for transistors to degrade after operating at too high temperatures. The dopants could diffuse away from where they are supposed to be.