Bottom line that tornado or those chips really don't do anything. The tornado is nothing but restriction and the chips aren't that great. The best things for MPGs are improving flow through the motor, tuneup, a tune, and the best one: driver mod. A basic short ram intake, least a downpipe/ubend delete, and tuneup will be cheap and easy to do. These mods will just make the motor more efficient and the tune will dial it in. Just changing the way you drive will make the biggest difference. If you really feel adventurous start looking at aerodynamics after you've done everything else.