I think you may or may not be able to do that, but I havent tried it. It display current consumption while you drive and one over a time considering driving style. In most cars you can reset trip clocks 1 and 2 etc, doesnt really give option to reset current or average consumption clocks, even in my Audi A6 there isnt such option in MMI controls, apart from reset MMI that may reset it, again never tried. But i guess if a reset is done through OBDI or through controls even might be possible. Cant try on premio as i am away from that car, but will have a look on A6.
Its been a while i followed this thread.
So thanks you all for good wishes. 
