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The lockup feature is not only good for mileage, it's good for performance, too. My 700R4 will lock up in 2nd, 3rd, or 4th depending on when I hit the button. If I lock it in 3rd gear at the dragstrip, it improves my e.t. by about 2 tenths and 3 mph, from 11.95 @ 114 to 11.75 @ 117. It also makes towing easier, as you can lock the converter early and reduce the heat generated by the slippage.
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