What gear you drive in is largely inconsequential to prolonging the life of your transmission, and limiting the available gears may in fact shorten it. It's the third gear that typically dies first, simply because of slippage - probably exacerbated by heat. If you still have your foot hard on the throttle during that third gear shift, you are giving that gear an extra-hard workout. I generally ease up just before that shift, (as I'm usually already going pretty fast by that point and it frequently just goes straight to fourth.)
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