>>I didn't know that, and I am happy to hear that steps are underway to change to metric.
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>I think it actually is a US law enacted by Congress a while back, to go to "dual systems," in preparation for all-metric someday (I'll have to look this up, now I'm curious). Most commercial items in US seem to use both systems now, anyway, like the can of coke I'm drinking says "12 oz (355ml)", and the print-toner by me has "store at only between a-b degress F, c-d degrees C."
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>>Apart from the cost, lets not forget the potential of confusions between the two systems, which may even cause accidents: Let's say the speed limit is 100 km/h, and the car driver goes at 100 mph instead (without looking at his modern instruments; using his sense of speed instead). Or an airplane pilot confusing feet with meters.
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>Yes, I quickly learned that on my first visit driving into New Brunswick Canada, where the speed limits seemed rather high :-)

Speaking of dual systems - English and metric...

I had a 1974 Vovlo which had parts from England and the rest of Europe. It was not fun to work on the car especially when underneath, as you never knew what type of tool to use – English or Metric. I finally decided to bring both types – what a pain!