Not Ranked
I used to change bottle after every two runs(7 second-180mph) and add gasoline on the in between runs that I didn't change bottle on--there was still about a half bottle but it becomes inconsistant when bottle gets lower than about half full(half empty?) That was with 10 lb bottle, you can easily put up to a 20# in a car trunk, but make sure you have a safty dump tube!!
Jerry
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