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Yes. It's because it doesn't know about lean burn. It cannot, because the car's OBD-II port doesn't say anything about it. Any OBD gauge will have that problem.
If your gauge kept resetting maybe you had a defective one. I've never had that trouble in 7 years with two gauges.
The DFCO thing was fixed in a later revision.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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