funflair
LIFE MEMBER
Never look at the speedo dial, head up display in the car and TomTom in the MH. And certainly don't do 6 x or any x tables as I go.
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Another way is to add on half of the mph figure then the 1st number of the original number Its not exact but near enough
Ex:
50mph = 50+25 +5 = 80.
70mph = 70 +35 +7=112