I've used 0w-20, 5w-30, and 5w-40 (Euro) in our 2018 CRV with the 1.5 turbo and could not tell a difference between any of them just driving. Honestly, could not see any difference in gas mileage either. Fuel economy is tied completely to driving patterns, but does not seem at all affected by oil grade, at least not that I could tell, and I calculate MPG on each tank and have since we bought the car new.