M.I.G. Security relies on its nine-strong Toyota Prius fleet for security patrols around Mandurah and surrounding areas, about 75km south of Perth.
Operations manager Paul Hiron said the longest-serving Prius, which has been used for patrols since 2005, is still going strong after 788,411km.
Hiron says reliability is vital to their business as clients depended on the company to give them peace of mind.
"Prius is ideal for our work, being quiet, economical and comfortable," he says. "It's ideal in stop-start traffic for fuel-efficiency and it performs on the open roads as well."