I am surprised by this. Did you air them out the same as your old ones? We're the new ones installed on the fronts or back?Got a brand new set of Bridgestone RE92's on my silver car. Terrible! I never realized just how bad they were until broken in. I think I lost 6-8 MPG. Of course they will break-in at some point and be normal, but when?
Jim,The effect is definitely real. The question I suppose is how big? The Insight makes it notoriously difficult to peg small MPG changes. I said 6-8MPG, but that is a pretty rough estimate. It might be a bit less.
maybe it is as simple as the increase of weight of the new tires.
what did the old tires weigh?
...still have the old tires?
This is definitely true. I race a Miata in SCCA IT-A, and though my age and reflexes prevent me from getting a good baseline comparison, I have friends who get everything the tire has to give. In this case the race tire is by Hoosier. The best tire, grip wise, is a new tire on the 3-4th lap of a 2 mile roadcourse. Different rubber entirely, but the effect is real.Jim,
P.S. This new/old tire stickiness effect is so pronounced on race car tires, they only consider running the tires on their cars with no more than one hot/cold cycle on them!