I agree with Mary about all variables being the same. Tires are the biggest factor IMO- even if two different tires have similar treadwear ratings, that doesn't make them equal. You can't compare a Mich PS2 to a Nitto Invo, they just aren't similar at all in terms of traction.
To give you an idea, my own car tested 1.0g with BFG KDW2 tires and around 0.95 with the Nitto Invos - the tires being the only change.
And while performance numbers are easy to compare and great to read, I wish more emphasis was placed on drivability. Not from Super Chevy's perspective, but from the customers. I always try to tell people that ultimate traction is great, but you really want the car to drive nice on the street. That's what made European cars stand out, easy to drive fast yet great for long distances as well. Getting a car to grip is easy, but combining grip with comfort and driving ease is another story.
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Matt Jones
Mechanical Engineer
Art Morrison Enterprises
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