I bought a new 2017 Rav4 and changed the oil at 1,300 miles, using Mobil 1 synthetic 0-20W AFE. I observed a small amount of tiny metal shavings in the discarded oil. With the factory oil, I was getting gas mileage as high as 51 mpg on the freeway (!) and typically more than 35 mpg. With the oil change, it dropped to 30 mpg.