Yes you can refill the bottle when it's half full. For nitrous i'd run the coldest plug you can find. Keep your timing around 10-11* and run some good gas as mentioned earlier. You'll be fine. I usually shut mine off right after i go through the quarter and pull it back with a four-wheeler. That's the only way you can get a accurate reading of the plugs.
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68 Camaro
Gene Fulton 632ci Two stages of Jug
8.41 164mph Rockingham 1-26-03
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