Is 15mpg all I can get??

I have a 2000 1/2 ton 4x4 ext cab silverado w/ the 5.3L. It has stock tires and suspension. I recently installed a K&N air filter on it, but it still can only get about 15 mpg on interstate and about 13 or so in town. I have tried changing driving habits, but it doesnt seem to help. I have heard of guys having problems out of the fuel pressure regulator, but I dont know if that would lead to poor fuel economy. Havent tried tuning it up yet, but checked a plug and it looked new. Also tried changing the fuel filter. Anyone got any good suggestions what to try next or is 15 the best I can get out of it??

io have a 99, and thats about all i get. i am getting an exhaust put on this week or so. i will try to post pics and let ya know

Maybe try the o2 sensors. Thats what someone told me. Mine need changing badly. All I get is about 16.5 and all my driving is highway

what type of fuel you are using cheap fuel like walmart gas, will cause great harm in your engine and lower fuel mpg

i drive about 50 miles a day and about 37 of it is highway miles and i am getting about 17.5 mpg i could probably squeeze a little better out of it if i changed my driving habits. i know quick starting and stopping is killing my mileage and most likely my brake pads too.

I've gotten 14 consistently out of my last 4 Chevy trucks regardless of engine size or gear ratio. '90 w/ 350, '95 w/ 350, '02 Tahoe 5.3, '02 HD 6.0.

Thanks for the advice... Looks like I'm just goin to have to pay for the gas and keep a light foot.

i get 21 on highway if i set the crusie on 68 but I drop down to anywhere from 18 to 16 depends on the head wind if i kick it up to 70. take in that the truck is doing the calculation. So the numbers might be off. I had a 99 2500 6.0 with 2 single chamber flowmaster and 305 tires and I got 9 to the gal. But i couldn't keep my foot out of it

I had a 2000 Silverado 5.3, 4X4 w/3.73 and consistently got 19-21mpg on the highway (which was 90% of my driving). I'm a pretty easy driver and use the cruise whenever I can. My '06 Silverado with the same set up and lower gears doesn't do nearly that well...shoulda kept the 2000 :banghead:

BTW, nice truck 06Z71, especially the color :)

I've got a '04 4.8 2x4, and 15.7 is the best I can get out of it. And that's driveing like I'm 80 yrs old. Should of kept the mustang.

i get an average of 17 mpg between my mix of highway and city, but all highway i have gotten around 20 mpg

what type of fuel you are using cheap fuel like walmart gas, will cause great harm in your engine and lower fuel mpg

how about costco gas???

What I have been told that alot of the gas station that are not major gas station like(chevron texco,shell,exxon, etc.) The low Grade station mix there gas with all different additives that why they are cheaper than than the others I'am from south Louisiana and know alot of people that work in the oil field and thats what I've been told:2cents: :2cents: