Have you tried to zero them the same way you zeroed the trip odometers? I haven't done this in a long time, but if you scroll to the item you want to zero and push the two buttons (on a 3 button clock) that you pushed to zero the trip odo, it should zero the item you want zeroed if my old memory is any good. The high speed reading zeros when you disconnect the battery as well as the others, but that would be a last resort. If you have a 2-button clock on your '08, the clock has been replaced for some reason and you need to get an owners manual for a later year (around 2010 would be my guess) to see how Mr. T says to reset, etc. those clocks.