that bottle will last longer than you think and it's usually like $2-$5 per pound to fill up from what i've seen. there's a shop that charges $4 and one that charges $5 close to me. i haven't checked any of the other import shops.

 

Dont you need a liscense to fill the tanks?

 

ok thanks a lot nitrousbob and nanaki.

 

no, it's not controlled.....automotive grade has sulphur added so you don't huff it.

depend where you live on the cost....cali is about $4.50 / lb
MI is about $2.50 /lb

usually fill up w/ 3 lbs or so still in it. the pressure starts getting too low to be effective.

never used a 15 lb'er b4...but i would guess about 12-15 full runs on a full bottle w/ 100 jets, using a heater and not getting stupid w/ a purge