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I think the only way you'll know is when you take off your intake manifold and inspect the valves. My bought my CPO 08 135i exactly a year ago with 47k miles on the dot. Now, with that kind of mileage I would have to assume that it must've been driven on the highway quite often. I added about 10k miles in the year I've had it and most of it was driven on the highway to and from school (80 miles roundtrip). The amount of carbon build up on cylinders 3, 5 and 6 was absolutely ridiculous. The car drives totally different now and I still need to adjust my throttle foot. I can't stress enough how everybody should have their intake valves cleaned if you have more than 20-30k miles.
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