I replaced all my tires from Bridgestone to Goodyear ReponsEdge tires. I have to replace them because those OEM tires had cuppings developed at around 19000 miles.
I see a around 3 MPG drop, which sometime more severe in short commute. I also realize that it is harder to switch to electric mode in slow speed driving (<30 miles per hour.)
I see the MPG drop as a compensation on a better handling and a quieter ride. On the other hand, after the MPG drop, I am still better than other similar car's MPG results.
Most of my milage are from Highway driving: usually 35 - 37 MPG @ 70 miles per hour (per my GPS). My Tire pressure is 36 on nitrogen.

ian