In the race to boost fuel economy, overhauling the internal combustion engine is all the rage. Ford, Hyundai and Mazda are among those focusing on direct injection, turbochargers and improved transmissions as they reinvent their powertrain lineups.So with its emphasis on hybrids, Toyota Motor Corp. may be missing the boat.
For all its r&d firepower, Toyota has been slow to popularize such technologies as direct injection and six-speed automatic transmissions. And it hasn't turned at all to turbochargers or dual-clutch transmissions, which rivals increasingly see as key ingredients in greening their fleets.
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