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Message: <blockquote data-quote="2010BlkGraniteNox" data-source="post: 1083" data-attributes="member: 11"><p>Actually that sounds about right for the 3.4. Hwy 20-22 is what I would guess. The newest engines have SIDI (direct injection) and run much leaner throughout the rpm band, increasing mpg's @ idle, and town. We are just stuck due to emissions requirements of running the same AFR @ cruise, but could infact run much leaner (increasing mpg's, but NoX would increase as well, but NA is one of the few countries that considers that separate from hydrocarbons)</p></blockquote><p></p>