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Some of the things that don't cost much:
Air up the tires to max sidewall or slightly below
Get an OBD adapter that will pair with your phone and download the Torque app or Dash Command.
Then you can look at rpm vs speed in top gear and keep the vehicle in the highest gear and the lowest speed possible.
Test to see if engine goes to idle when you put it in neutral at speed, if so, then that should help (note to rev match when going back to "D")
If you drive to where the transmission won't shift into overdrive due to speed and load, turn off the overdrive if possible, that will allow the torque converter to lock in direct (like the old days when you take a truck out of overdrive when towing)
Hope this helps, I did this with a 2005 Ford Focus Auto and consistently got 38-40MPG on a vehicle rated 29MPG highway
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Staying Focus'd on MPG
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