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Hello -
Sounds like a job for an independent wind tunnel facility.
The top-of-the-line Prius V does come with P215/45R17 tires standard. The Toyota website rates all models of Prius at 0.25 Cd, but that doesn't mean they tested each model separately. It's still a cheap shot because it weakens their argument. I'll bet they *did* do the 15" test, came out closer to even, slapped on the 17s, and found their loophole. If he wanted to be more sneaky, he could have said a "Prius V" was used in the test, and left it up to us to figure out the tires were 17s.
I thought the Cd for cars was calculated for all cars, not actually tested in an "official EPA" wind tunnel.
CarloSW2
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