A method includes simultaneously driving a load via first and second magnetically coupled regulator phases for a first duration, uncoupling one of the phases from the load after the first duration, and, after uncoupling the one phase from the load, allowing a current through the one phase to decay. The breather system has two breather openings provided in the fuel tank, breather hoses respectively connected to the breather openings, a T-shape joint integrally connecting the breather hoses, and a check valve connected to an ambient side of the T-shape joint, and the two breather openings are provided on the right and left sides of the fuel tank so as to be spaced apart from each other. The disk assembly has a particular burst pressure that is generally temperature insensitive over essentially the entire temperature operational range. A signal filter receives the energy signal and generates a noise indicator for each frame portion based on whether noise is detected in the energy signal. The manual input may include accepting entry of a utility pricing schedule that corresponds to scheduled price changes of a utility. The present invention also relates to the isolated promoter variants and to constructs, vectors, and fungal host cells comprising the promoter variants operably linked to nucleic acid sequences encoding biological substances.