Hey guys, I'm hoping that some of you can help me figure out what is causing my truck to get the fuel mileage it's getting. Before I start explaining I understand that I drive a truck and I don't expect 25 mpg out of it but I do like to think that I should get better than what I am getting.
I bought my truck about a month ago. It is a 2010 Silverado Ext. Cab Z71 4x4 with 9,000 miles. The truck has a few aftermarket parts that I know of, An Airaid CAI, Gibson cutback exhaust, and it has the rough country 2 inch leveling kit. I'm also running BF Goodrich All Terrain tires 285/65R/18. Since I've had the truck I have filled it up twice. I calculated my mileage after my first tank and it came out to 12.9 mpg. I calculated my mileage again after the second tank which included about 200 miles of highway driving and it came out to 15 mpg.
Doesn't this seem low for a 5.3L? I know it has slightly larger tires and the 2 inch leveling kit but I figured the exhaust and CAI would make up for whatever mpg I'm loosing. The only thing I can think of is if the truck had been programed prior to my buying it and that is whats causing me to loose gas mileage. If this is the case where could I take it to have it checked? I don't think taking it to the local chevrolet dealership is my best option since they might void my warranty if they find out it has been programed.
I bought my truck about a month ago. It is a 2010 Silverado Ext. Cab Z71 4x4 with 9,000 miles. The truck has a few aftermarket parts that I know of, An Airaid CAI, Gibson cutback exhaust, and it has the rough country 2 inch leveling kit. I'm also running BF Goodrich All Terrain tires 285/65R/18. Since I've had the truck I have filled it up twice. I calculated my mileage after my first tank and it came out to 12.9 mpg. I calculated my mileage again after the second tank which included about 200 miles of highway driving and it came out to 15 mpg.
Doesn't this seem low for a 5.3L? I know it has slightly larger tires and the 2 inch leveling kit but I figured the exhaust and CAI would make up for whatever mpg I'm loosing. The only thing I can think of is if the truck had been programed prior to my buying it and that is whats causing me to loose gas mileage. If this is the case where could I take it to have it checked? I don't think taking it to the local chevrolet dealership is my best option since they might void my warranty if they find out it has been programed.
