I read a NAH review awhile back - can't for the life of me remember where - but it mentioned that the OEM tires were not low rolling resistance tires. The Continental ContiProContact isn't listed as a LRR tire on their website.

I can't understand why Nissan wouldn't offer a LRR tire except that fuel economy wasn't their main goal with the NAH as they only released it in the eight states they had to in order to meet emmission standards. It was probably easier and cheaper just to offer the same tire they use on the non-hybrid.

They should have offered the ContiPremierContact which is listed as a LRR tire.

I've read that the Toyota Camry Hybrid edges out the NAH in fuel mileage but seeing how the TCH comes with LRR tires - Michelin® Energy™ MXV4® S8 - that probably could be the reason for the difference.