Quote:
Originally Posted by ctgottapee
You have to be very careful
You must stick only to versions offered as OEM equipment on new vehicles, as the auto makers do pay for the research to lower MPGs.
The tire makers have cleverly used the same labels on other tires that don't get near the same mileage.
|
I think what ctgottapee is trying to say is that the OEM versions have the lowest RR - AND - since each one of those versions is built to the OEM's specs, you shouldn't expect to get the same result from other tires with that same name.
Allow me to add: Once a tire is no longer supplied to the OEM, it usually reverts back to aftermarket specs which means worse RR, but better traction and wear - and it may be difficult to know when that has happened.