This invention provides compositions for repelling insects, particularly biting insects, such as mosquitoes, ticks, and biting flies comprising ratite oil, active fractions of ratite oil obtained by flash chromatography or compositions comprising mixtures of fatty acids found in ratite oil. A report template is defined and data is extracted from the reporting datastore. A contact piston has a piston rod and sealing members secured thereon. Advantageously, the relevance values computed by the system are less dependent on, or independent of, user subjectivity. The image display screen, thus, receives and displays the magnified image-modulated light beam, which is switched by the image-light-path switch module. If the ethanol concentration is determined to be above a given threshold, engine operation is adjusted for lean combustion of the fuel.