For those of us who are pinching pennies, there is a free MPG booster out there. It's simple and easy to do! This rarely used booster is called drafting! Best used behind semi trucks. Where I would normally be getting around 12 MPGs going up a hill, I get 15. And when I'm just cruising down the highway, I get 30-40 where I would normally get 18-25. Just thought I should spread the knowledge! Just don't be in a hurry when you're trying to save gas because we all know semis like to go a little slower than we do.