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"many twins these days"
The vast majority of piston twins in service now were built from the mid 50s to the mid 80s. The first half of those would have been originally equipped with airspeed indicators that read in MPH. Included in that would be Cessna 310, 320 and 411s, Beech Queen airs, twin bonanzas, barons and Piper turbo aztecs, all of which would be able to climb to 18,000', especially well under gross weight. 180 IAS at FL180 is 244 true and even in MPH that's really cookin'. Still, most of the previously mentioned planes would be able to do 180 mphtrue in the upper teens.
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