I agree, it helps with brake wear simply by conservation of momentum. I think it also is helping to extend the life of the transmission in my Honda Accord. I haven't done any sort of empirical study, but I'd estimate my driving habits eliminate greater than 50% of the 1-2-3 shifts. Car has 260k on it, but I unfortunately don't know if it is on the original transmission or not. Would be cool if it was though.
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