Review on 🔌 Set of 4 New DENSO #4503 Platinum T-T Spark Plugs - PK16TT by Matt Jenkins

Replaced Spark Plugs on Toyota Prius 05 12/30/16. No previous issues, just hit 155,000 and finally time to change it. Maybe it's placebo, but it seems to me that the engine runs smoother. It is currently 4/17/17 and it works fine. Just achieved the highest fuel economy per gallon in the car's history - 53.6 mpg. The same 81-mile ride has been done many times before, achieving 51.4 mpg. Weather has a lot to do with the Prius' mileage, but everything else stays the same, including tires and 38psi pressure. I find the main mileage in the Prius almost no wind, cloudy (no air conditioning, heat or windows down) and 50 to 60.