I exchanged a few emails with Goodyear regading this tire. I asked them if they had a rolling resistance coefficient for the tire using one of the two accepted industry standard formulas (See Wikipedia) and received this reply:
I am forwarding your email to our Marketing Department for a response. I am not aware of any direct comparisons between the Assurance Fuel Max and the Michelin Energy. We do have direct comparisons to our Goodyear Assurance tire however and the Fuel Max has a 27 % improvement in rolling resistance over the Assurance. It has 4% greater fuel efficiency which translates to a savings of approximately 2600 miles worth of gas over the life of the tire.
XXXXXXX XXXXXXX, (Name witheld by me)
Consumer Relations
Hopefully we will have a more complete answer in the next few days.
Sad to say, they don't have R14 for the NHW11 models
They did say, and also say on the website that more sizes are being released, including a size for the Pruis (did not say which one, or if both).
RFB