Quote:
Originally Posted by oldtamiyaphile
Always beware of the term 'up to'.
It's a 30% gain only in the narrow band that HCCI will operate in. So owners won't be seeing 30% reductions at the pump. It's a bit like lean burn or cylinder deactivation.
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It actually is exactly lean burn. The only reason they are doing a spark-assisted variant of HCCI is to allow leaner operation. It will be interesting to see what they have to do for NOx emissions control to meet the Tier 3 emissions standards in the U.S. - that is a real challenge for any lean strategy, whether it is some sort of gasoline HCCI concept or diesel.