A friend of my daughter has a 93 Caprice LS, 305, analog speedometer. She cornered me the other day and said when she is just sitting still, the speedometer reads 90 mph. She also said the trip odometer racks up miles like mad even sitting still, something like 45 miles sitting in a drive thru at Taco Bell. I've never looked at the car personally. Anyone seen/experienced something like this? It's a new one on me, all I can think of is speedo cable bad......