Does anyone know the following info?

MPG City?
MPG Hwy?
Range?
gallons of fuel left when light comes on the dash?

and also if you could share how you feel i could improve my fuel economy..

This may sound stupid, but i saw a commercial for one of those Tornado Air Intake Gizmos,, they look like a joke but was wondering if anyone had used or heard of how these work and if they really do make a difference..