For less than the price of the JD kit you'll be able to buy about 7 x various Suzuki and ktm/Yamaha needles as others have suggested.
Also, not knowing US fuels or colder climates I can't give you specifics which I know will work. I am in a tropical climate; hot and humid all year around. Add to that unknown squish clearance and efficiency, and added load from the AWD system and its a lot of variables to account for. A W/H diameter needle is probably not a bad start but you'll need to fine tune from there.
My stock 300 on stock engine got 60km to reserve (when first owning a 2T and not really being much more than a competent rider). After head mods and better jetting, and going to a 250cc engine giving it a lot more throttle a lot more often, and shorter gearing I can usually get 100km to reserve. It's a pretty significant difference.
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