Official YARIS Wheel & Tire Guide

[shastatodd]

Will a larger diameter tire which will lower engine revs give me better fuel economy? Most of my driving in on the freeway. The stock tire is 175/65/R14.
I can get the Michelin Hydroedge in:
185/65/R14
185/70/R14 or
195/70/R14 (assuming this tire will fit the clearances)

While bigger tires are heavier and less efficient, they will also raise the effective gearing,lowering the engine revs which should benefit MPG's right?

Thanks in advance for the help with this.

Todd