What is the average gas mileage that you guys get with your 5.3? In town and interstate. I have a 97 chevy truck now and might get a newer truck if it get a lot gas mileage. With the 97 I get 12 in town and 16 on the interstate. Also if you've had any mileage improvement over stock, and what did you add? Thanks :)

I have a 2000 5.3l 4x4 Sierra Ext Cab

I average about 16MPG mixed highway and city driving with a pretty heavy foot :D

I also have a flowmaster exhaust, K&N open element filter setup and a custom tuned PCM.

My MPG is about the same as it was with the stock PCM and the exhaust/intake mods.

16-18 on the 2005 Tahoe... If the new trucks had the displacement on demand then you would get a little better on the highway....

My 2000 ext cab 4x4 with 5.3 stock gets 18-19 highway 75mph max. Around town get 15-16. Towing my 18ft 1500lb flat bed empty gives 16mpg and with a full load trailer--12mpg.

Mine gets around 14-15 around town. I haven't clocked it on a trip but better than my old truck.

:ww: Hello, just bought a 06 silverado,5.3 ext cab,lt with all creature features,18.2 around town.no long trips yet. Bobby

Hey guys i'm new here just thought i would chime in, my 5.3 gets 17-18 around town as good as 20-21 highway, but I also drive like grandpa. The only engine mods are a 40 series flowmaster and an AEM brute force air intake.

dailydragger03 i take it yours is 2wd. thanks guys

I average about 16 in the CC in town. I haven';t really had much of a trip in it yet

Yeah bcj67chevy its bagged on 20's. I use chevron techron fuel system cleaner at every oil change and my gas mileage has never dropped. The truck has 69k miles on it.

My 03 Silverado extended cab SWB 4x2 was getting 18-19 on average. It went down when pulling my 5000# RV trailer though. Even when I had the Whipple supercharger on it, it still got about the same, except for when my foot got heavy. Blowing the doors off of the little souped up ricers was a hoot!

My 2000 ext cab 4x4 with 5.3 stock gets 18-19 highway 75mph max. Around town get 15-16. Towing my 18ft 1500lb flat bed empty gives 16mpg and with a full load trailer--12mpg.

Basically exact same truck, I get the same #'s consistently.

gotta love the supercharger.:metal:

mine gets between 14 and 16 city (i drive it like a transam) and 22 highway with the a/c off.

On my 99 Z71 EC/SB w/ the 265 tires and 3.73 gears I'm around 13 in town and 15-16 on the highway (70-75) during the warm months. I lose 1-2mpg in both situations.

My truck has almost 118,000 on it, new plugs/wires at 100,000. I replaced the fuel filter when I bought it, around 80-85,000, might be time for a new one. Anyway, I haven't seen any increase or decrease w/ the new plugs/wires, and I put a new cat back (magnaflow) on it about 2 weeks ago and that didn't seem to do anything mileage wise, but it is winter.

I'm jealous of these guys reporting 18/19 w/ virtually the same truck, just newer, I drive my truck w/ a light food and don't think I could get that mileage driving 55 all highway.