N1EF is stock. I think 40P and 176M is stock, so you can try that.
It looks like you are rich on the bottom and lean up top based on that needle. I bet that AWD system sucks power, so I don't think you want an NEXX needle, as they are slightly leaner and have less hit on bottom.
Not sure how AWD effects mileage but it can't be good. Keep in mind a stock Gas Gas 300 only gets 45 miles to a full tank (give or take a few), so that is around 18mpg. Is the AWD sucking down another 10MPG??? We'll it could...but a leaner pilot should help, but I doubt you are going to see a dramatic improvement. No way a needle or pilot change is going to improve your MPG by 10.
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