Intake air flow modification

[Compaq888]

I've restricted my intake and it did increase my mpg by 1 but it killed power. Everytime I had to go up a small hill it would downshift because the car barely moves as is in 4th. I also opened up the intake and lost 1mpg but there is more power in the low end and the engine breathes better. I think the best setup would be to have a special box that opens up based on rpm conditions. Like in front of the airbox. It's better to stay in highest gear and use more fuel than to downshift and use even more fuel.