2005 2.4 lite Toyota carry let has 201000 miles and is burning oil castrol syntec 0W-40 about 3/4 quart every 1500 miles. What can I use to free up piston rings & oil rings in oil crankcase? Also getting bad gas mileage been using gum out in gas tank used 4 bottles 16 Oz so far only averaging 25 miles per gallon.

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25 is about what those things get. And that small oil useage is normal according to toyota. No cleaner willffix that, but do change the pcv valve and pray it's just that