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The 10R80 gear range isn’t different enough from the 6R80 to make a big difference in my opinion. The advantage I see of having 10 gears is that they are close enough that drivers may not complain about the transmission shifting all the time.
In order to maximize fuel economy we need the transmission to shift frequently, but many drivers don’t seem to like it when transmissions downshift and RPMs increase significantly. With 10-speed transmission the top 7 or 8 gears are only spaced by about 20%, which should make it more seamless.
Because there are more transmission gears, Ford may choose taller final gearing for gas engine. Combined, these may improve MPGs a little. I expect the new engines will make a bigger difference, particularly the diesel which is going from 3.2L to 2.0L.
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