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Originally Posted by mwebb
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 .
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To the contrary, what auto makers must do to meet EPA mandates for emissions is very detrimental to fuel economy. To claim otherwise is a very poor argument.
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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 .
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There Are lots of cars with carbs still. Go to any car parts store and they have brand new carbs for sale. It it is irrelevant that cars with carbs get worse fuel economy than cars with fuel injection. What is relevant is cars with carbs exist and get better fuel economy with a clean airfilter.