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Originally Posted by WVGasGuy
I checked the link for tips. I'm not sure I follow their logic. First they say dirty air filters don't affect FE, that it just makes the car more sluggish. Then they say it simply causes the engine to reduce the amount of fuel being used.
I'm not sure these guys are mechanical engineers but it seems like what they are really saying is if one whould clog up their air filter then your auto's computer will decrease the amount of fuel to the engine and increase your FE? I know that's not what they meant, but it sounds like they have conflicting statements?
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First of all CR didn't make a bunch of theoretical guesstimates and then explained it. They did real world measurements and then attempted to explain what they saw.
This makes sense to me. A car has an optimum ratio of air to fuel. In the olden (carbeurators and no computers) if the airflow was restricted the engine did not receive enough air and it did not run efficiently. With the sensors and computers in today's cars each is monitored continuously. If not enough air flow is received the car will adjust how much fuel is injected. Yes, the result will be to press harder on the gas pedal, but that's only when accelerating.