I'm mostly metric and happily occupy myself converting to imperial as we go. This did backfire once in particularly bad weather riding the The Dean 300, 2 of us suffering, we turned right at the sign on the B4211, the sign clearly states 'Newent 6',
Me: "Only 10km until we stop"
<ride on a bit>
Partner: "Did you say, 10?, OK so 16km to go"
<ride on a bit>
Me: "Did you say 16miles?, that's almost 26km, not sure I can make it that far without food, it's probably about 20k still"
<ride on a tiny bit further>
Spots a sign, only 1/2mile left, we're there...
![facepalm :facepalm:](/forum/Smileys/classic/facepalm.gif)
We'd ECE'd the start & both really needed food by this stage!
![facepalm :facepalm:](/forum/Smileys/classic/facepalm.gif)