Every driver would like to save a few dollars on gas. Consequently, the market for fuel-saving devices -- and fuel-saving hoaxes -- is large. See how well you can separate fact from fiction with our quiz on fuel-saving device hoaxes!
Question 1 of 10
What do fuel ionizers and fuel catalysts claim to do?
Question 2 of 10
Is it more efficient to roll down the windows or use the air conditioner?
Question 3 of 10
Where was water injection first used?
Question 4 of 10
How does hydrogen compare to gasoline?
Question 5 of 10
How efficient is electrolysis in a hydrogen generator in producing hydrogen?
Question 6 of 10
True or false: Petroleum fuels can be significantly altered by fuel-line magnets.
Question 7 of 10
Do high-flow air filters improve fuel efficiency?
Question 8 of 10
What does an intake vortex device actually do?
Question 9 of 10
How does an engine react to a vapor injector?
Question 10 of 10