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The D with a circle will allow the transmission to shift into overdrive which reduces engine RPM"S and will conserve fuel when on a highway cruise. The D without a circle will not let overdrive engage. this is useful when traveling on hilly terrain where overdrive tends to engage and disengage. I usually drive in the circle mode unless i am climbing uphill and the transmission keeps downshifting and upshifting. Rule of thumb: Circle D on the highway, and plain D in the city

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Q: What is the d in a circle for on the gearshift do you drive in that or the plain d?
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