Hi guys; Bob Wilson is correct when saying that a skillful driver can exceed the efficiency of cruise control.

On the topic regarding driving a steady speed, there is a different issue. When the 6 of us were driving in the record attempt, we knew that what affords the super high mpg is MAXIMUM TIME SPENT ROLLING WITH THE ENGINE OFF. Having the car roll as long as possible is the key. In comparison, when I drive a steady speed in my Insight, my ultimate mpg comes from about 42 miles per hour, 5th gear, lean burn; which yields about 108 mpg..............

2005 Insight

89.3 mpg lifetime

Video camera replaces outside mirrors