This document provides a roadmap for the development and implementation of fuel economy policies for ASEAN Member States (AMS), aimed primarily at regulators in government agencies who are or who should be involved in fuel economy policy development. The roadmap is intended to serve as catalyser to engage all relevant stakeholders from government, industry and academia. It not only addresses experts but can also be used to inform the interested public about the issue of vehicle fuel economy. This roadmap is meant to be used to advance fuel economy policies within the AMS, and also for AMS to venture together towards more coherent and eventually common policy approaches. It neither aims at a one-size-fits-all approach, nor does it provide country-specific policy proposals. Rather, it offers a policy toolbox that presents fuel economy policy measures, different data and regulatory requirements, and the steps for introducing them.