Second, there’s a great, dare I say BRILLIANT post on here about pacing which I suspect this is (although do not discount the value of more gears to allow you to spin a bit faster and save your muscles) from Sir Neal (ex-of Wahoo/The Sufferfest ).
Take a look at this, Sir Erik @TrapMeSuf and see what you think:
Edit: I will add that this strategy worked VERY well for me on a long climby event.