Season 4 rounds out our first year of podcasts, and what an interesting year it's been. This season we look at the future of fuel, including battery electric and renewable natural gas, and our tried-and-true diesel engines. We also have one special episode that's bound to put you to sleep. Our guest list includes Alan Schaeffer of the Diesel Technology Forum, Hugh Donnell of Cummins Westport, Paul Rosa of Penske Truck Leasing, and Rob Molloy of the National Transportation Safety Board. And HDT Editor in Chief Deborah Lockridge joins host Jim Park for a discussion on alternative fuels, the cover story from our October issue.