\documentclass[a4paper]{article}

\usepackage{pgfplots}

\begin{document}


\pgfmathprintnumber[relative=1.6]{0.1}
\pgfmathprintnumber[relative=1.1]{0.1}

plots:

\begin{tikzpicture}
\begin{semilogyaxis}[yticklabel style={log ticks with fixed point}]
	\addplot+[domain=0:10] {exp(x)};
\end{semilogyaxis}
\end{tikzpicture}

\begin{tikzpicture}
\begin{semilogyaxis}[yticklabel style={log ticks with fixed point}]
	\addplot+[domain=-9:1] {exp(x)};
\end{semilogyaxis}
\end{tikzpicture}

\end{document}

