Mileage stretchers. One of the latest in a long line of devices that claims to stretch fuel, the Fuel Doctor is, by most accounts, a dud. And really, they're all bogus. The same is true for things like the Velocity Tuner, the Tornado, the FuelBoss, or the magnets that have been pushed under all sorts of names. Whether they're ordered from late-night TV infomercials, discount auto-parts stores, or Walmart, it's all the same.
Consumer Reports just tested the Fuel Doctor but could find "no significant difference in any evaluation." Somehow that's not that surprising.
If the automakers could get a 30-percent fuel-efficiency improvement for $19.95 plus shipping and handling, don't you think they would? I know, I know; it's all a conspiracy, right?