Preface Biofuels: Potential Effects & Challenges of Required Increases in Production & Use Selected Issues Related to an Expansion of the Renewable Fuel Standard (RFS) Calculation of Lifecycle Greenhouse Gas Emissions for the Renewable Fuel Standard (RFS) Intermediate-Level Blends of Ethanol in Gasoline, & the Ethanol Blend Wall Biofuels Incentives: A Summary of Federal Programs Biofuels: DOE Lacks a Strategic Approach to Coordinate Increasing Production with Infrastructure Development & Vehicle Needs Index.