The RX DI combines the 1000 series Rotax marine engine, with Orbital Direct Injection technology for precise throttle control, amazing power delivery, and a quick, chokeless start, allowing an up to 37% increase in fuel efficiencies1, and delivering an up to 75% reduction in exhaust emissions2 . New and improved in 2002, the RX DI has lowered the fuel octane requirement from 91 to 87 and increased the fuel efficiency level by 23% over the 2001 engines, thereby saving you money.