Too bad, Honda does their homework when it comes to engines. The relevant part below:
Honda's message at the 2009 Tokyo Motor Show was very clear, and this message was reinforced by CEO Takanobu Ito during a Q&A session that was held for North American media at Honda's headquarters in Tokyo this afternoon. The topics ranged from Honda's position on BEVs (Battery-powered Electric Vehicles) to their plans for future sports cars, but for the most part the conversations always circled back to Honda's view of eco-technologies: Hybrid Electric Vehicles in the near- to mid-term, and hydrogen fuel cell vehicles for the long run.
I asked about the status of A-VTEC and i-DTEC. I think the question was interpreted differently than I intended because Ito-san spoke mostly about how VTEC technology could be used to reduce pumping losses during cylinder idling and regenerative braking functions.
A followup question from a journalist in the audience specifically asked about Honda's plans for diesel. Essentially, Honda has shelved their plans for introducing diesel in the US, and there were several factors involved. First off, development was delayed by about a year due to difficulties meeting emissions regulations. Honda resolved the difficulties, but the solutions were costly. Faced with these costs, Honda's board of directors ultimately gave up on the idea of offering diesel technology in the US. However, Honda are continuing to work on the technology in hopes of making the costs more reasonable.