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Automatics are heavier and you have to use energy to pump fluid around.
Now once everything is locked up the only real difference is all the extra spinning weight. Think how some here worry just about wheel weights.
The perfect tranny for MPG would be a CVT. With proper programming the engine would stay at its peak economy based on load and throttle inputs.
But they still have reliability issues.
The one thing missing, the transmission nor ECM can look ahead and judge terrain or traffic conditions...YET!
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