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Originally Posted by jjackstone
Actually if I recall, from MetroMPG's and other's posts, the alternator disconnect has been showing about a ten percent gain in overall FE. Please correct me if I'm wrong.
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MetroMPG's car is so optimized he could go on a diet and loose 5 pounds and get a 10% improvement. His results in magnitude of improvement are not typical gains for an average car.
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The TE generators do work but as has been stated are highly inefficient-- unless a newer technology has been released, they are generally between 3-5% efficient.
Doesn't matter what gear the vehicle is in, just the temperature differential between the "cold" side and the "hot " side of the junction.
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Driving in first at high rpm is the best way to heat up the exhaust. The car is burning the most fuel it can in a given time and the engine is under the least load, hence the pistons are extracting the least power from the combustion gases and the hotter the exhaust gases.
Actually winding a car up in neutral at full throttle would be better for heating the exhaust but you would probably throw a rod.
