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You just need to get a scangauge or other obd2 software find a road from 0-55 like a left turn onto the highway. And test it. I have found in my KIA most efficient is holding the thottle to TPS 25 and that's about half throttle. Shifting from 1> 3> 5 slowly going.
In my girlfriends 6 speed auto 2.5 I-5 2009 jetta its best to push it 3/4 of the way in getting to speed quickly and into 6th as soon as possible.
I would think most if not all automatic transmission cars are better off going slowly from a dead stop until 5MPH and then using 3/4 throttle.
I also think the manual transmission can accelerate more efficient ly. The difference in my KIA accelerating slowly and smooth vs quick heavy throttle and shifting at 2k rpms is nothing I have seen a difference at 1-4 mpg and during accelerating. Now in the jetta it is a much larger 4-8 mpg from a dead stop to 55 or 65 mph
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