I'm not seeing much on the speeds for an A-10 refuel, but I would think that 250-270 knots sounds about right. Any higher and she would burn too much fuel just to stay with the tanker. Especially since the KC-135 can move at about 500 knots @ 30,000.
Now a question for Herr-Berbunch. What key do you have bound for your mic switch aft? I'm thinking you were using the wrong radio for contacting the tanker, but I could be wrong.
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