Questions before ordering

[kennyd]

Good morning ,Ihave been enjoying the benefits of the available knowledge on this forum and now thanks to the good folks of php for adding the incentive of a sale on their product I am going to order a tuner , but have a few questions I am sure can be answered by the community of members. My vehicle is 2008 f150 4x4 reg. cab short bed, 4.6 a/t , used as daily driver around 70 miles a day , no towing ,some hauling -tools, canoe, dead deer , some offroad. Right now just stock ,but cat back exhaust and gotts mod in next few weeks.As a daily driver I would like improved mileage ,but also more power would be nice , if I drive decently I can get around 18mpg ,can it get better with a tuner. Do I need custom tunes or canned and if custom then what?
Thanks in advance.
Kenny