I own a 2004 4.8L ext cab silverado. THe mileage is decent, running at about 17-19mpg overall. I was looking into several enhancments such as performance chips and cold air intakes that would increase power and overall mileage. With the total of the 2 items, it's around $700, so, is it really worth it?

 

Nelsonperformance.com the best $375 you will ever spend on a truck, K&N intakes, well worth the money