Simulation and Engine Tests Demonstrate Improved E85 Cold Startability with Increased Fuel Injection and RVP: Honda engineers investigated the vaporization characteristics of E85, and results were reviewed to develop a method to improve the cold startability of an E85 engine. Various fuels of E85 and gasoline were prepared for the study of vaporization characteristics at - 30 deg.C. When Reid vapor pressure (RVP) is the same for both E85 and gasoline, the concentration of combustible mixture produced upon fuel injection is lower for E85 compared to that of gasoline. Thus, the cold startability of an E85 engine is poor. This chapter reports study results obtained with simulation and engine tests and validation of the methods developed to improve cold startability of an E85 engine.