I hear you guys keep mentioning about resetting those numbers. how do i go about doing that?

 

On the 2010 450h I have, one can use the steering wheel multi-information switch where you 1st scroll to the average MPG LED display on the instrument panel, and you then press straight down on that steering wheel switch for a few seconds to reset the readout information.

 

press and hold the enter button?

 

I have a friend with a Prius she was going to not ever reset and keep a "lifetime" average for the car. However, someone reset it playing around with the buttons. Oww...grrr.

 

Yes, hold down the "enter" switch once the average MPG is displayed on the instrument panel LED.