A bit confused, all the different parameters the on board computer gives you works, as far as I'm aware, fine, however, the trip distance, that sits under your total mileage figure, always zero's everytime I drive the car? I thought this just counts until you physically reset it using the black push button? Also the mpg and range figure change, for example, driving to work with 1/2 a tank of diesel the range was indicating 320miles and 53mpg, turned the car on to go home 9hrs later and the range had changed to 150 miles and the mpg had reset itself? I thought these sort of parameters stayed constant until you reset them on the right hand stalk?