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!
What do fuel ionizers and fuel catalysts claim to do?
minimize fuel flow using ionic fields
dissolve smog-producing agents in fuel
alter fuel to make it burn more efficiently
Is it more efficient to roll down the windows or use the air conditioner?
roll down the windows
use the air conditioner
use the air conditioner when at speed, but roll down the windows in start-and-stop traffic
Where was water injection first used?
in heavy locomotives in the 1940s
in propeller-driven fighters in World War I
in propeller-driven fighters in World War II
How does hydrogen compare to gasoline?
Hydrogen has higher specific energy and higher energy density than gasoline.
Hydrogen has lower specific energy and lower energy density than gasoline.
Hydrogen has higher specific energy but lower energy density than gasoline.
How efficient is electrolysis in a hydrogen generator in producing hydrogen?
about 25 to 40 percent efficient; not enough to produce fuel for transportation
efficient enough to replace 75 percent of a car's gasoline use
efficient enough to provide 30 percent of a car's gasoline use
True or false: Petroleum fuels can be significantly altered by fuel-line magnets.
Do high-flow air filters improve fuel efficiency?
no, although they could increase horsepower
yes, they increase efficiency by 20 percent
no, they reduce mileage and horsepower
What does an intake vortex device actually do?
It limits horsepower and acts as a restrictor.
It increases horsepower by smoothing out intake airflow.
It increases horsepower by making intake airflow more turbulent.
How does an engine react to a vapor injector?
It will burn fuel more efficiently, thanks to the added vapor.
It will compensate for the added vapor by limiting fuel flow.
It will increase fuel flow to make the vapor mixture richer.
True or false: Gasoline burns the same whether it's vaporized or in liquid form.