kwillymac on converter slippage numbers I would not know what I was looking at. I am just going by your MPH and it is right on the money for your ET so I would say what ever slippage that you have has to be right for your ET & MPH. May be one of the guy's that knows more than I do will pipe in on there opinion if they feel my info may be wrong. From your 10.70 @ 126 your car is efficient.