You are misunderstanding my statement. I'm not comparing pressure that is below a vehicle's recommended pressure, and what is advised by the manufacturer. Such lower pressure is never recommended or good. Tire performance would definitely suffer.

I myself, use the generally recommended 42/40 on my Prius with the original factory Goodyear tires.

I would never go higher than that with the factory tire, no matter what the potential milage gain. Yet I see others here recommending that.

I see that you are using high performance summer tires. And they are going to behave much differently than the factory tires, and certainly offer better performance in dry weather no matter what the pressure.

I, though, live in Duckland.

Lance