95
MPH on a long trip to Texas last month. I was on I-10 and two cars passed me, both with visible radar detectors, and they were going about 100
MPH. I swung in behind them and chased them a couple of miles and hit 95 in the process, then decided I didn't want to risk a $180 ticket and backed down to 80 again....
It was as smooth at 95 as it was at 75 though.....handled it like a charm.....