No. It increase your fuel economy with a performance air intake and added more horsepower in every single drop of fuel in your pedal.
Because Air intake draws in a higher volume of air which may be much cooler, your engine can breathe easier than with a limiting stock system. With your combustion chamber filled by cooler, oxygen-rich air, fuel burns at a more efficient mixture. You get more power out of every drop of fuel when it's combined with the right amount of air.
With more air in the chamber, you can also burn more fuel than before. That's how a performance intake puts power at the pedal for you: reducing air temperatures, balancing fuel mixtures and providing more air for combustion.
So you're getting more power from every drop by burning more efficiently, your engine uses less fuel at all times - city or highway drving.
it's the fastest way to burn-up the gas mileage improvements provided by a performance air intake. Your best bet is to keep your driving habits relatively unchanged, enjoy the extra power at the pedal, and collect on the gas mileage savings..
enjoy