While looking into heel-toe shifting, I came across this article. It gives a good overview of manual transmissions and shifting techniques. I've driven manuals much of my life, but this gave me a few good pointers to learn/use. Quite long, but might help you become a better driver and extend the life of your transmission.
http://happytogether.com/318ti/notebook/shifting/
http://happytogether.com/318ti/notebook/shifting/
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