What Kioshi did, basically shifts at 10 mph, is a pretty good "economical" way to drive. But, it doesn't rev the engine over 2500 rpm. You do need to let the engine rev SOME to break in properly.
When I'm driving for economy and not trying to stay out of the way of traffic, I usually drop into 5th at about 35-40 and just idle up to cruising speed. Yes, the Yaris handles low RPM in higher gears just fine. (just don't expect it to accelerate from there)
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