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The rough rule of thumb I use is that a mile running burns about 100 calories. On that basis you're burning about 2000 calories on your long run. Fat comes about 7.7 calories per gram so if you were to metabolise only fat (unlikely) you would burn about 260g (1/2 lb) of fat. That's not sufficient to explain 2 lb of weight…
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I run quite a bit and 8 mph is pretty handy for a first 5k equates to under 23 mins although treadmill speed does not translate well into race speed (usually you're about 10% slower when running on road/smooth grass). I would let myself be guided by my reaction and if you're exhausted you're going too fast. i'd try around…
