I took my 2019 Prius for its first oil change since I purchased it. I had been going to Take 5 for my 2nd Gen Prius. Their choices in 0W-16 were Mobil 1 or Pennzoil. I chose Mobil 1. Maybe it's my imagination but the car seems to be getting worse MPG since that oil change. Is this a case where the Toyota oil is the best to use? Thank you.
