[Z15]

Your truck has a modern computer controlled direct injection motor. Regular air filter (OEM) vs. a CAI or performance filter will have no effect on fuel efficiency. The ECM is programmed to adjust Air/Fuel (A/F) ratio to predetermined spec’s., so increasing air will mean the ECM will adjust the fuel to the programmed A/F ratio. Basically cold air intakes and performance air filters make minimal HP increase and give the illusion of more HP simply because they make more noise over factory setups and people tend to justify their purchase by embellishing the performance and fuel economy.

If you read the fine print he makers are careful not to make mileage claims. RE:

- HOW WILL A K&N® FILTER AFFECT MY VEHICLE'S FUEL ECONOMY?
K&N® does not make any claims or advertisements regarding fuel economy.

- CAN COLD AIR INTAKES IMPROVE GAS MILEAGE?
K&N® does not make any claims or guarantees in terms of increased gas mileage with the use of K&N filters or intakes, due to a vast number of variables that can affect a vehicle's gas mileage.