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not on a diesel and how many carberated systems remain
the new diesel common rail systems use intake restriction to improve EGR flow at cruise , so partially restricted air filters will have little to no detrimental effect on FE .
there are so few cars with carbs remaining that it does not matter ,ALL cars with carbs get poor FE compared to systems with fuel injection and engine management .
Quote:
Originally Posted by ConnClark
Those tests were on new throttle body or fuel injected gasoline powered cars. A clean air filter does improve mileage on diesels and cars with a carburetor.
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