Eggman-Are you using a Scanguage or Ultraguage?
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Neither. I bought the OBDLink LX Bluetooth adapter and use my phone for custom displays using the supplied software. It cost $50 and is pretty flexible. I made small mention of it in my garage blog here.
I like it a lot.
My '14 ES CVT got really lousy MPG during the break in period. I couldnt manage better than 30mpg on the interstate at 65-70. After that, MPG got much better. Never as good as my Versa, but that guy is much better suited to interstate driving. The Mirage gets best MPG at 45-55mph range. Typical of most any vehicle.