We propose a novel approach to bus energy minimization that targets crosstalk effects. Unlike previous approaches, we try to reduce energy through capacitance optimization, by ad opting non-uniform spacing between wires. This allows reduction of power, and at the same time takes into account signal integrity. Therefore, performance is not degraded. Results show that the method saves up to 30% of total bus energy at no cost in performance or complexity of the design (no encoding-decoding circuitry is needed), and limited cost in area.