What index will my 72 be in?

the slowest you can dial is the class index...

if the index is 12.00 and you can only run 12.20...you will be dial in at the class index of 12.00...

if the class index is 12.00 and you can run 11.50...you can dial under the class index to match what you can run...

if you race a car in the same class...the first car to the finish line wins...no break out.