16 inch wheels and tires vs stock 15s

About 0.5 L/100km difference. In MPG (US) that would be the difference between 45 MPG (US) and 50 MPG (US) or another example 40 MPG and 42 MPG (US). The reason why the difference is not uniform is that MPG is not a linear scale. The impact depends on the starting value and the larger the MPG figure the more dramatic 0.5 L/100km looks.

Yes, look for it on the home page.

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I don't think there would be a 5 mpg loss going from 15 inch to 16 inch wheels. That's about what you lose going from 15 to 17 inch wheels, and that's with the relatively heavy OEM 17 inch wheels on the trim level 5.

I'm going to put 16 inch wheels and tires on our Gen 3 when the current set of tires wear down.

I got some Subaru 16 in rims that weigh in at under 17 lbs. They might weigh about the same as the 15 inch OEM rims.

Here's a pic I took when I test fit the wheels on the Prius when I first bought them.

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You seem to have missed the point I was making. 5 MPG is only one example, the other was 2 MPG due to the non-linear nature of the MPG scale. And yes it is possible as I was quoting from experience.

Those Subaru wheels look nice btw.