The manual is rather confusing on this subject. Would you believe up-shifting at 12 mph? Downshifting at 3? As I recall, that is what a manual called for. Reason given was for mileage.
I agree, 20 mph feels about right as well. I´d suspect it would NOT shift at 40 mph. In any case get it moving, and then up shift, when it is convenient.
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