Quote:
Originally Posted by greenfire
Doesnt more air going in require more fuel and that in turn would lower your MPG??
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Not necessarily. If you can reduce the amount of energy required to draw in air for combustion, and then expel exhaust gases you can realize an improvement in fuel economy. This is because the power that was being used to do those other two functions can be used for other work. The gains won't be huge, but every little bit helps.
If economy was better if airflow were restricted we would have tiny air filters. If you would like to experiment by all means take some cardboard and cut it to shape to block a bunch of air flow then stick it in front of your air filter. Let us know what your results are.