sometimes the bottle is too hot to fill up all the way, but will charge you for the full fillup anyways, sometimes I can only get like 5-6 lbs in a bottle and the pump stops pumping b/c it can't work anymore. freeze those bottles before you bring em in, or at least leave 1 lb in there so they can bleed it off and cool the bottle some. I have gotten 12 lbs in a 10 lb bottle before b/c it was chilled properly.
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98 se-r w/ p/r cai,jwt s3 cams, stillen header, courtesy exhaust, ur pullies, JUN flywheel, ACT clutch, eibach springs, kyb struts, st sways, cusco camber plates, f/r strut braces,stillen lower control arm brace,SMC BAKB, motul 600 brake fluid, lotsa bushings, and a bunch of other crap