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The 3.7L's increased power is easy to control thanks to in-depth tuning of the drive-by-wire system by Hummer engineers. Daryl Ehrlich, Hummer development engineer, says, "At lower speeds, throttle response is tuned for improved control, but as speed increases, the throttle control is tuned to be more responsive." Engineers also vary idle air control and automatic transmission shift pressure to make the H3 capable and easy to drive off-highway. View Related Article
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