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Not to rain on the parade here, but...
If you wanted to go to that extent (making transmission gears), and were really looking for high mileage numbers, you would be better starting with a much smaller engine.
Modifying an 1100cc engine to any extent to increase mileage potential isn't practical or efficient.
If mileage numbers are the goal, sell the GS and get a 250 Ninja or CBR - then mod from there.
Jay
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