Negative power consumption, a.k.a. my car generates power!!!!

[mod72346]

According to my car, the total average consumption is -0.8 mi/kWh!!!! Amazing, how braindead the software is, put out by Porsche.

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[swerob]

Interesting puzzle.

Looks like it might be representing the trip odometer distance internally as 1/32768ths of a km, stored in a 32 bit signed integer. That would allow a range of -2**16 km to +2**16 km.

64388 mi -> 103644 km

103644 - 2*(2**16) -> -27428 km

-27428 km -> -17042 miles

-17042 miles / (-0.8 miles/kWh) -> 21032 kWh

64388 mi / 21032 kWh -> 3.06 kWh/mi

Is your efficiency around 3.1 kWh/mi?

 

[mod72346]

The actual efficiency is somewhere between 2.5 and 3, I think

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