i just bought a 2002 tahoe ls 2wd and on the way home i was checking gas milige, i filled up and set it to zero. when i stoped to get a drink 150 miles or so down the road i cut it off when i started it back up the trip meter was back at zero... it happens everytime i start the thing. anyone else have this problem and/or know how to fix it?

thank you
scott

 

anybody??