so last night I was on the highway doing about 78 ish then all of a sudden i saw a cop on the side of the road. I then put the car into the tiptronic mode and then downshifted while braking a little bit to avoid the cop's attention. When I got off of the highway, I noticed my speedometer being a little sluggish and not as sensitive and responsive. Does anyone have any idea what may be wrong with my speedometer or am I just paranoid?