# group separator with savetrees

I am trying to have a group separator between 3-digits groups. However the package savetrees removes the group separator. Here's my MWE:

\documentclass{article}
\usepackage[utf8]{inputenc}

\usepackage{siunitx}
\usepackage[subtle]{savetrees}

\begin{document}
\num{100000}
\end{document}


How can I have an output like this: "100 000" without removing the savetrees package? Any ideas?

• Welcome to TeX.SX! You can have a look at our starter guide to familiarize yourself further with our format. – Seamus Jun 28 '16 at 10:30

The savetrees package sets \thinmuskip to 0.0mu plus 3.0mu rather than the standard \3.0mu. The easiest solution is to reverse that

\documentclass{article}
\usepackage{siunitx}
\usepackage[subtle]{savetrees}
\AtBeginDocument{\thinmuskip = 3mu}
\begin{document}
\num{100000}
\end{document}


but that will apply to all uses of the value. We might therefore hard-code the skip

\documentclass{article}
\usepackage{siunitx}
\usepackage[subtle]{savetrees}
\sisetup{group-separator = \ensuremath{\mkern 3.0mu\relax}}
\begin{document}
\num{100000}
\end{document}

• I ended up using the first option as it didn't change the page-count of my document. – Joey Jun 28 '16 at 11:28