Cheat sheet

Do you know how fast 70 kilometers is in MPH?

BOZEMAN, MT - - We left our campground in Glacier and rode through smoky areas much worse than Glacier.  Tomorrow it's more smoky areas, but now we're worried about Hurricane Irma which looks set to kick the crap out of Florida.  Maybe it won't trash Ormond Beach.  We've got hurricane prep in  place...now we wait.
     While we were in Canada I employed a 'cheat sheet'  to equate my speed (mph) to the correct equal of kilometers or at least close.  A kilo equals .62 mph so the easiest speed zone of 100k equals 62 mph.  You'll note on close inspection that I've rounded off a lot of figures.