"It claims to have the best effect on vehicles older than two years," said Consumer Reports tester David Champion. "And also claims to have some effect on vehicles that are newer."
Consumer Reports tested the Fuel Doctor device in 10 different vehicles. Six of the cars were equipped with a highly accurate fuel economy meter. Testers then measured fuel efficiency for both city and highway driving.
The other vehicles were put through acceleration tests to see if the Fuel Doctor device increases power as claimed. Then the tests were repeated without the Fuel Doctor.
So in the end?
"We found it made no significant difference at all. The only thing we saw, the light was on," said Champion.
As you may have figured out by now, Consumer Reports' tests show that the Fuel Doctor does not improve your gas mileage.
But what will get you more miles per gallon is the tried and true.
- Avoid fast accelerations and braking hard.
- Do regular maintenance on your car.
- Watch your speed.
- And keep your tires properly inflated.