I dealt with something similar yesterday. Cop's tailling me, set the cruise 1 or 2 above the limit figuring i'd loose him by slowly sneeking a couple cars up once i got on the freeway. He didn't have his radar on so i was just patient and waited for the freeway. WRONG-freeway was a parking lot and he was right with me all the way til my exit.

Between the cop and the freeway i don't think i got over 80km/hr on that trip home.

Sometimes you just have to have patience and know there will be another time to be a bit more spirited. And hey, if you would have pulled off and let him pass the only thing you could do is catch up to him, and that can't look to good.