Insert it into your car's 12-volt socket, and save gas?...

(DISCLOSURE:  I have not yet had an opportunity to conduct what I would consider reasonable tests to give an opinion on this device...at the moment, I am only publicizing that the device exists.  If I ever get an opportunity to document my experiences, I intend to update this information...)

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I received a Fuel Doctor FD-47.  I've seen the commecials on television...I'm sure you have, also.

"FD-47 cleans the power that your vehicle uses to operate. As your vehicle ages, the electrical systems tend to experience more electrical noise or electrical interference. This noise can have many detrimental effects on the various electrical components in the car. By removing or reducing this noise the vehicles electronics can operate more effectively and/or efficiently."


"...regardless of if your vehicle operates on gasoline or diesel fuel the FD-47 works on the vehicles power systems and is independent of the fuel type that the vehicle uses.


"...The FD-47 works on the 12VDC power systems and is independent of the size of the vehicle.


"...Fuel Doctor is confident in its product and offers a 30-day money back guarantee as a pledge to your satisfaction.


"...once the FD-47 is plugged into the 12VDC power outlet that is tied to the electrical system that is responsible for controlling the drive engine of the RV...


"...the FD-47 works on motorcycles...


"Our field and lab tests have shown up to 25% better...


"...optimal effects are seen with cars 24 months and older."

"FD-47 CAN NOT be use on Hybrids or Electrical Vehicles."



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Before using the FD-47, they recommend the following procedure to obtain a baseline:

1. Fill the fuel tank...
2. Record the mileage on the odometer...log it as "Mileage A"
3. Drive until the tank is less than half full.
4. At the same filling station, using the same pump as before (because pumps can be differently calibrated), fill the tank ...log how many gallons it takes to fill the tank.
5. Record the mileage as "Mileage B"...
6. Subtract Mileage A from Mileage B (which will give the amount of miles driven)...
7. Divide your answer by the number of gallons it took to fill the tank...this will give the a baseline miles-per-gallon figure.

To begin logging the amount of fuel that might be saved by using the FD-47:
8. Now, plug in the FD-47 (and drive the car until the tank is less than half full)...
9. Fill the tank at the same station using the same pump...log how many gallons it takes to fill up the tank.
5. Record the mileage as "Mileage C"...
6. Subtract Mileage B from Mileage C...
7. Divide your answer by the number of gallons of fuel most recently put in the tank.

If the FD-47 saves fuel, you might notice the difference in miles driven before using the FD-47...and those that were while using the FD-47.

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With it being available from Best Buy stores, I assume there must be some credibility to it.  As always, I recommend that you understand what Best Buy's return policy is before you purchase the device from them...