I'm a bit reluctant to urge you along (via keyboard tuning) but submit you could both improve MPG while maintaining performance.
Not to "rub it in"...but my 900SS Ducati yields 50MPG. I know your 250 can do way better than 38.
Also, in view of your ignition coil mods...reluctant to urge you doing too many changes at a given time...
Can you confirm you've got adequate valve clearances? Checked within service manual recommended mileage interval? A very important prerequisite.
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