Quote:
Originally Posted by Occasionally6
If there is a choice between only having gears 1 and 3 (say) and gears 1,2 and 3, where ratios 1 and 3 are the same, and 2 splits them, three gears will allow the engine to be operated closer to its highest efficiency than will two of them.
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But when the intermediate gear is actually not so intermediate, thus too closer to the previous gear and with a longer gap to the next (or with a longer gap from the previous and too closer to the next), which is what has been more usual, it ends up not increasing the efficiency so much...