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I also had a 38.2 MPG 50 mile segment that was somewhat helped by an extended 4 mile gentle downhill.
Mine is the 7 speed. I find that anything below 70 MPH in 7th gear and ECO mode does not work well. The RPMs are too low for the engine to run smoothly in 4 cyl mode. For smooth 4 cyl operation, the RPMs need to be at least 1400. If running at 60-65 MPH, I keep it in 6th gear when in ECO.
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