MPG indicating : 5.9 ???

[Cortona]

Could this be caused by a installation of an in-dash Clarion ( for SIRIUS ) stereo ?

( I removed the factory radio and tape deck )

Is there something in the factory radio that works entire car computer system ?

 

[|esteban|]

is this when the car is in PARK or when DRIVING?

 

[Cortona]

Driving ( and parked )

Does not seem to affecting actual MPG...... ????

 

[Detrich]

it seems like no one chimed in on this problem... i have the same issue with my 99 323i...

basically the computer says i get 5.9 MPG, but in reality i'm getting around 320 Miles per 16 gallon tank- which translates to about 20MPG. all the other gauages on the computer seem to be accurate- ie Temperature, Miles remaining etc.

does anyone know if a computer reset will fix this problem or what the specific cause is?

curious minds want to know...
thanks!
g