95' 4runnner 3.0 3Vze auto tranny

question 1. I pull a 15' aluminum bass boat quite often and I do some city driving and 45 to 65 MPH on some country roads to get to the lake. Should I turn the overdrive off or on when i pull the boat? It seems like it is shifting in and out of 4th gear continuously when im in the country roads on 60 mph cruise control.

Question 2. My current gas mileage is 13 mph average. If I were to get a Downey cat back system and and Downey air intake what kind of MPG could I expect? WOuld I get more power to pull the boat up those steep hills?

THanks for all the help. <img src="/forums/images/graemlins/baby.gif" alt="" />