[truckster]

Here's a fuel mileage myth: That anything you add to your vehicle or your fuel tank will have a bigger effect than your right foot.

My niece came to me because her Toyota truck was getting far worse mileage than was advertised for the model. She asked me about tuning, mileage devices, etc. I told her to tell her husband to lighten up his right foot. She thought for a minute and said, "Well, he has gotten three speeding tickets since we bought the truck."

Driving habits have far more to do with fuel mileage than most people realize.