I just want to clear something up. Hypermiling isn't a true mpg. Hypermiling isn't a 'driving' mpg. It is the hypermiling mpg, just as city is city and highway is highway.
It is a lot of coasting downhill and to red lights, as well as slower starts off the line. There are MANY factors that contribute to it, such as changes in elevation and drivers in your way or trying to plow over you as you coast, TRY to use cruise or take off slowly at lights (aka FL Snowbirds) or in large metro areas. I tried it well over a decade ago and it can make a difference, but difficult in my area.
Many of us have achieved 35 or 36 mpg in actual highway driving only w/o hypermiling. 40+ is attainable through hypermiling, but DAMN it's boring, restrictive and reminds me of the Sunday drives my parents forced me to go on. ugh
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