Using a 75 shot I would get 7 good runs till the pressure was to low for a safe mixture. I was using a wet system and I did not want to wash out the cylinders with raw fuel and no nitrous to help burn it up. When I was using the gas I figured it at 2 minutes a bottle. In my area $4 lb it was easy to spend $40 on a bottle fill just on Wednesday night racing.
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