Ive read alot of other forums on this before deciding to get one. It seems to depend alot on how you drive your truck, and how often to haul or tow. Some people had as much as 2/3rds of the can full (dont know the volume of the can) but these were people with two speeds....stopped and floored.

Mine came in on friday but havent had a chance to install it yet because the included mount wasnt in the box......Starting to get a bad taste for Moe's Performance. Whenever I try calling it goes to a voicemail thats always full...