Temp issues / pellet concerns

Okay, so I have questions about temp and even temps on low and slow cooks.
I was advised by the dealer that if I want a slow and low cook that I need to pull the handle all the way out and a hot cook to push it all the way in. The handbook says a little differently anyone able to shed the correct info?
Second of all my first cook was last night and I cooked at 240 and it seemed to have eaten up a lot of pellets, 20 lbs in 7 hours?
Florida temps at night were 60s at some time fromn6:30pm when i started it and 4am the pellets ran out based on my temp chart.
Tonight I'm doing a brisket so I will better monitor the pellets better until I can find out why I am going through so much pellets.
I was advised by the dealer that if I want a slow and low cook that I need to pull the handle all the way out and a hot cook to push it all the way in. The handbook says a little differently anyone able to shed the correct info?
Second of all my first cook was last night and I cooked at 240 and it seemed to have eaten up a lot of pellets, 20 lbs in 7 hours?
Florida temps at night were 60s at some time fromn6:30pm when i started it and 4am the pellets ran out based on my temp chart.
Tonight I'm doing a brisket so I will better monitor the pellets better until I can find out why I am going through so much pellets.