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mine says you "should" not go above 30% for regular playing around but 35% to 40% was good for racing. the higher % you go the more wear and tear is on your engine...i use 30% traxx nitro for mine...works like wonders..no problem so far..some fuels i heard to stay away from are blue thunder (i think dont remeber that much) becuase it doesn't have enough oil and will lessen the wear of you engine very quickly and make it sieze.
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