Update (moderncv v2.0)
With moderncv v2.0, the command to be patched is no more \maketitle but \makehead and the length to be changed is now \makeheaddetailswidth, so the correct patch for this version is
\patchcmd{\makehead} {\setlength{\makeheaddetailswidth}{0.8\textwidth}} {\setlength{\makeheaddetailswidth}{\textwidth}} {} {}
Original answer (works with older versions of moderncv)
Making it a little simpler, you can patch \maketitle through the \patchcmd command from etoolbox (loaded by moderncv) so to set the length \maketitlewidth to \textwidth.
That is, add the following lines to your preamble:
\patchcmd{\maketitle} {\setlength{\maketitlewidth}{0.8\textwidth}} {\setlength{\maketitlewidth}{\textwidth}} {} {}
MWE:
\documentclass[12pt,a4paper,finnish]{moderncv} \moderncvstyle{banking} \moderncvcolor{blue} \usepackage{babel} \usepackage[latin1]{inputenc} \usepackage[T1]{fontenc} \usepackage{fouriernc} \usepackage[scale=0.75]{geometry} \firstname{Jesse} \familyname{Jaanila} \title{Curriculum Vit\ae{}} \address{Mannerheimintie 21--23 C 38}{00250 \textsc{HELSINKI}} \mobile{+358 45 2580 777} \email{[email protected]} \patchcmd{\maketitle} {\setlength{\maketitlewidth}{0.8\textwidth}} {\setlength{\maketitlewidth}{\textwidth}} {} {} \begin{document} \thispagestyle{empty} \pagestyle{empty} \makecvtitle \end{document}
