Honda has a system on many of their newer engines, that holds the throttle valve open and uses valve timing instead. At low load, it holds the intake valve open past bottom center, so some of the cylinder's contents are pushed back to the intake. A smaller fuel/air charge is ignited in the cylinder, producing lower power while still having a more open throttle.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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