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Yes around town and below approx 50 mph use 3 which is direct drive whereas D is overdrive for cruising. The SVX has high gearing as you must have observed when watching the tacho.
If you are in D around town or on a winding road the tranny will constantly hunt down and up from D to 3 causing udue gear and friction surface wear. Also the torque converter will be slipping more and creating extra heat. What is more in very dense slow stop go traffic it can be good idea to stay in 2 for the same reasons.
It is a good thing to do a little thinking for the tranny. Auto it may be but it has a limited brain ! You will find a lot of info. and discussion on this subject in posts here if you do a search.
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Trevor, New Zealand.
As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! 
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