Never seen this formula before,,,,,always open for NEW stuff,,,ran my car's numbers through this....the numbers come out just about exactly what I thought my car OUGHT to do. Like others,,I'm off about .3 in 1/8 and 1/4. I only have about 50 passes on my car though, and still trying to get 60' where they should be(my estimates)...so I would say, the formula is pretty close!!

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