The global medium and heavy duty vehicle (MHDV) market is changing due to rising fuel costs and environmental concerns. These issues are pushing commercial and government fleet operators to consider investments in fuel efficiency technologies and alternative fuels. Navigant Research estimates that more than 1.2 billion light, medium, and heavy duty vehicles are on the roads globally today?and less than 5% belong to the MHDV segment. Of these vehicles, over 94% utilize a conventional internal combustion engine (ICE) powered by either gasoline or diesel. The MHDV segment represents only a small percentage of the total vehicle population. Yet, it accounts for a large portion of the total fuel and energy consumed in the road transportation sector because of the low average fuel economy and high annual mileage typical of MHDVs. Governments are examining programs to speed the adoption of alternative fuel technologies and reduce local emissions. Less expensive alternatives to petroleum-based fuels, such as natural gas, liquefied petroleum gas (LPG, also known as propane or autogas), and electricity, are beginning to make inroads. According to Navigant Research, global annual MHDV sales are expected to grow from 4.7 million vehicles in 2016 to 7.3 million in 2035. This Navigant Research report analyzes the global MHDV market by four major categories: medium duty buses, heavy duty buses, medium duty trucks, and heavy duty trucks. Each of these categories is also broken down into 10 powertrain types: conventional gasoline, gasoline hybrid, gasoline plug-in hybrid, conventional diesel, diesel hybrid, diesel plug-in hybrid, battery electric, natural gas, propane, and hydrogen fuel cells. Global market forecasts for annual sales and the number of vehicles in use, segmented by country and powertrain type, extend through 2035. The Excel databook accompanying this report also includes new options for the user to select specific data of interest, including pivot tables and dynamic tables and charts.