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It all depends on your vehicle. Keeping your vehicle in its most efficient power producing state is not keeping it in its most efficient fuel using state. I just had this discussion on an S10 forum, where they guy swore up and down the vehicle would be more efficient if I kept it in 4th at highway speeds because that put it in its power range.
While its true that it is producing the most power, its not using the least fuel at the point. The point of our conversation was that the extra power/torque is not needed, so its essentially going to waste. If its going to waste, why even bother to produce it?
You are on the right track when you say its taking more throttle to accelerate in a higher gear than just using the lower one a little longer. The key is to find the sweet spot where it takes the same or less throttle to continue accelerating after shifting up.
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