Reviews & Testimonials

Well, after a full 30 day trial of the Fuel Doctor, I have to say that I am overwhelmed by the increase not only in my per-tank mileage but also in my uptick in horsepower! Prior to the Fuel Doctor, I was averaging approximately 280 miles per tank. Since installing the Fuel Doctor (quite possible the easiest installation on the planet!), I am not exceeding that number but blowing it away by 25% or 350 miles per-tank-full. Now, 350 seems like it's going to be the average very soon.. as long as I keep the Fuel Doctor plugged in! I want to thank you for including me in your test.. I am not only recommending it to not only my family and friends but also my colleagues!

William S.

I have to say that I am very impressed with the Fuel Doctor! I have been using the product for two months now and my average per tank of gas prior to using the product was approximately 260 miles per tank. Since installing the Fuel Doctor, I am averaging 360 plus miles per tank. I want to thank you for including me in your test. I have told hundreds of friends, family and colleagues and they are waiting for the product to hit the market. Good Luck!

Vince C.
California

The Fuel Doctor is amazing! It was effortless to install. I immediately felt an increase in acceleration in my 03 Tahoe. I am also getting 70-85 additional miles per tank. I am saving over $400 a year, so I’m recommending it to all my friends.

Chris B.

I was a skeptic about the Fuel Doctor claims. Since there is a money back guarantee, I decided to give it a try. The results blew me away. I have a 1997 F150 and noticed I always get a range of 12 MPG City & 17 HWY. My average is 14.3. Within a week I have noticed an average of 18.7 MPG. That is a 4.4. MPG increase over the same route I always take. Thanks.

Stanley S.

I tried the Fuel Doctor on my 2002 Toyota Sienna V-6, with over 163,000 miles. I usually average 22 MPG, but with the Fuel Doctor I averaged 25 MPG. In today’s economy, that extra 3 MPG goes a long way with all the driving I do. Thank you!!!

Julia S.

I own a 2003 GMC Yukon XL that has 158,000 miles. Since using the Fuel Doctor my vehicle shifts much smoother not to mention I have also noticed that I have filled up at the gas station less. My mileage has consistently increased by 3-5 mile miles per gallon depending on the type of driving. Thank you Fuel Doctor!!!

Steve Y.
California

I have owned a Limousine company for several years and keep accurate records on the mileage of my fleet. In my business, fuel charges are one of my top expenses every month. Since using the Fuel Doctor, I have noticed a modest change of 6-10% in traffic, but have noticed a much greater change on the highway when driving. With the prices of fuel fluctuating constantly, it is great to know that regardless of the price of fuel, I have something that will help me reduce my costs. Thanks.

Arsen M.

I have a pilot/escort company so we travel all over the U.S. I used the Fuel Doctor and was surprised. My 2008 Chevrolet 1500 w/5.7 at high speed (70-80) normally gets 13-14. With the Doctor I get 16-17! At lower speeds, like when I am following a load at 60-65, I would normally get 15-16, with the Doctor I went to 21.9! I also did a lead job in high winds and before I would get 14-15 MPG and with the Doctor I was getting 16-17 MPG! I would recommend the Fuel Doctor to a friend or family member

Terry K.
California

Fuel Doctor really does improve fuel efficiency and saves money! My MPG before was 30, now with the Fuel Doctor, it's 32. I would buy another Fuel Doctor for my friend or family member.

Scott M.
Georgia

On a recent trip from Colorado Springs to San Diego (over 2700 miles) at speeds on I-70 and I-40 of 70-85 mph, I averaged over the entire trip 17.2 MPG.

One one tank where I-40 was reasonably level I got 19.5 mpg. We calculated that we saved over $50.00 on this one trip alone and I intend to purchase one for my Duramax diesel!

Carson C.
Colorado

The best mileage I ever got on my Kia Rio on the highway was 40 MPG at 55mph. With the FD-47, I got 46.5 highway at 63mph. Its great!

Tony G.
New York

The Fuel Doctor is an exceptional value, it saves me money, and has increased my MPG! My '03 Ford Taurus used to get 17 MPG before the Fuel Doctor, now it gets 19.

Ray N.
Maryland

My Kia Van normally gets 19-20 MPG. While traveling from Sturgis, SD to Sioux City, IA, I calculated my MPG during the stops with the Fuel Doctor: 23.349, 24.106, 22.806, 29.555, 21.781. The final 126 miles from Monroe City to St Louis, I got 30.769 MPG! Our average over the whole trip (518 miles) was 26.718 MPG!
I ACTUALLY SENT A LETTER TO ALL THE PEOPLE IN MY NEIGHBORHOOD TELLING THEM ABOUT THE BENEFITS OF FUEL DOCTOR!

Thomas D.
Missouri

My city MPG is 18 MPG. Using the FD-47, it maintains 20 MPG. And on the highway, my MPG is 23 to 24 using the FD-47! Your car just runs better!

Lincoln P.
Florida

I don't really understand how this thing works, but it does what it says. I commute 75 mile each day with a 1998 Camry that would average about 28 mpg. My first tank full using the Fuel Doctor, pushed me to 33 mpg. This will pay for itself in no time.
What's great about it: EASY TO USE AND SAVES $
What's not so great: NOTHING
I would recommend this to a friend!

BestBuy Customer WB53095
Wisconsin

Does a Great Job!

Product does what it claims! It decreased fuel consumption on my 2006 Outlander by about 20-25%. If anything will improve your gas mileage, I'm all for it. And for the price, it pays for itself in no time! I'm glad someone was smart enough to come up with this. All you do is plug it in and drive. A real no-brainer and a green product for the world.

What's great about it: Product does what it claims! It decreased fuel consumption on my 2006 Outlander by about 20-25%
What's not so great: Nothing, if anything will improve your gas mileage, I'm all for it. And for the price, it pays for itself.
I would recommend this to a friend!

Best Buy Customer jedroundkick
Florida

Thank you for taking my call the other day. I was already a raving fan of
your product but after speaking with you and learning more about your
company, indeed, I am very impressed! I learned long time ago people don't
buy stuff from people but they do buy from people who know their stuff.

I recommend you product all the time and purchased my first one over a year
ago. No warm up or break in period was experienced as the fuel milage gains
for my BMW was immediate and significant. Typical winter highway milage is
18-22 MPG. I was stunned to watch my MPG steadily tick upwards topping off
at 33 MPG!! Instead of burning a 1/2 tank of gas the total consumption was
less than a quarter of a tank or more than 3/4 of a tank of gas available
for future trips.

Fuel Doctor has never failed and works all the making believers out of my
social net work.

Thanks again for a great product,

Bob M.
New York

I can't believe that it actually worked. I went from driving approximately 230 to 250 miles to empty, to now getting over 300 miles per tank within 2 weeks. I absolutely like this device. I'm not really clear how it works, I just know that it works great. I've already recommended this device to friends, family and co-workers.

What's great about it: Good price with great results.

Best Buy Customer Jaismom
Indiana

Extremely happy with this product it saved me a lot of money !
I would recommend this to a friend!

Best Buy Customer (Anonymous)
California

I bought the product last month at BB. I was skeptical about it however saw the advertisement on TV so I thought why not. I saved myself money in two weeks. I usually fill up every 9/10 days but now my car lasts until about the 14/15 day. I saw a big improvement in my gas mileage. I recommend this to BB customers. Just note that my car is four years old, it says on the packaging works best in cars two years or older. So if your car is less then 24 months old I am not sure if you would have the same result.

What's great about it: It was very easy I just plugged it in to my car. Saved Money within two weeks.

Best Buy Customer J0310
Florida

16 MPG before to 18 MPG after the Fuel Doctor! I would recommend the Fuel Doctor to a friend or family member!

I have a 2002 Ford Excursion 7.3L diesel, 303,000 miles. Immediately noticed smoother idle and improved overall performance. Good for another 300,000 miles.

Bruce I.
Minnesota

I have a 2005 Kia Sedona. I was getting 14 miles per gallon and now getting 20! I also had you send one to my son, still waiting for his remarks. Thanks again for your excellent customer service!

Elmer S
Arizona

Best product ever! My wife has one on her 1998 Daewoo and it has improved the mileage on that car too! I have saved so much money with the FD-47 that it has paid for itself in the money it saves. The more you drive the more you save!

2005 Ford Taurus
MPG Before the Fuel Doctor: 21
MPG After the Fuel Doctor: 28
Thats over a 25% increase in MPG!

Tom F
Georgia

This product works as advertised! I love it. I was skeptical at first but thought its only 50 bucks and for a tank of gas, I would find out for myself. I am so glad I did! I was literally watching my mileage increase driving in the city. I went from 440 miles per tank (mpt) to over 500. WOW! I have my Christmas presents already picked out.

Tim N.
Texas