John I don't know what 25-75 HP engines needed to be Tier 4 back in 2008. It was not AG tractors. I think that was other motors. That final date of 2013 is what the tractors where working off of. I called and asked a friend that is still an JD salesman about it.
The major tractor builders built a LOT of Tier 3 tractors last year just for inventory. They knew that there was going to be demand for them.
Another thing people are not talking about between Tier 3 and 4 is the added cost. On the smaller tractors (25-75 HP) it is between $3500-5000. On the larger tractors it is closer to $10,000.
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