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Matt, the 05 Armada had a 5 speed auto and 4.10 gears. The 05 Exped had a 4 speed auto and 3.73 gears. Overdrive and drive are similar, so the Armada has 3 gears where the Exped had 2 so the Armada's first and second were geared for 'launch'.
As I mentioned, that changed somewhat when the Exped went to 6 speed in 07. The 07-09 Exped feels much faster, as it should with 2 more ratios.
It's all about gearing as the engines are pretty similar.
In my experience, the Exped returns slightly better fuel economy than the Armada. I drove Armada company cars for a while then requested an Altima or Maxima when I couldn't stand to feed it anymore. But all full-size SUVs suck and none are consistently over 20mpg, so does it really matter?
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