I live in Louisiana and am averaging about 44 mpg with my '15 Mazda 3 automatic in a driving regimen consisting of about 90% highway and 95% air conditioning use.
I don't hypermile per se, but I do try to drive a bit slower than the average traffic around me when I can do it safely. The speed limits on the highways I normally drive on range from 55 to 75 mph. When I can, I drive 55 in the 55 mph speed zones and around 60 in the higher speed zones when I can do so without getting hit, but when so threatened I step it up closer to the speeding zombies around me.
For me, it's all about the average speed and, of course, such things as wind velocity and direction.
Since I have an automatic, I can't comment on shifting strategies and RPM.
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