Editor’s Note: Electric versus Conventional Vehicles Philip Weinsier, IJERI Manuscript Editor	3
Prediction of Heat Treatment Distortion and Optimization of Manufacturing Tolerances for Selected Gears Akaff S. Diam, University of Northern Iowa; Julie Z. Zhang, University of Northern Iowa; Ali E. Kashef, University of Northern Iowa	5
Development of a Regression Equation for Predicting Concrete Strength Tamer M. Breakah, Ball State University; Joseph Osei Safo-Kantanka, Ball State University; Sherif O. Attallah, Ball State University	16
Fuel Economy, Annual Fuel Costs, and Maintenance of Conventional and Electric Vehicles Kay R. Morgan, Indiana State University; M. Affan Badar, Indiana State University; Suhansa Rodchua, University of Central Missouri; A. Mehran Shahhosseini, Indiana State University	25
Optimizing Power Consumption in a Liquid Crystal Display John R Haughery, Iowa State University	34
Optimizing High-Strength Concrete Using Polynomial Curve Fitting for Mix Proportioning Michael C. Pickett, US Army Corps of Engineers, Huntsville Center; Shane Palmquist, Western Kentucky University; Jason Wilson, Western Kentucky University	43
Optimization of Abrasive Machining of Carbon-Fiber Reinforced Polymers Jaby Mohammed, Illinois State University; Jamal Sheik-Ahmad, Khalifa University	49
Tandem Ball Bearings vs. Tapered Roller Bearings: A Brief Review of Utilization in a Differential Gearbox Antonio Cesar Silva Sacco, Paula Souza Technological Center; Audie Trabachini, Paula Souza Technological Center; Mauricio Torres, Indiana Tech; Clovis de Souza Dias, Paula Souza Technological Center	57
A MATLAB-Based, Free-Space Radio-Frequency Propagation-Loss Simulator with Graphical User Interface Gene L. Harding, Purdue University; Matthew Engstrom, Purdue University	63
Instructions for Authors: Manuscript Formatting Requirements	68