20mpg average possible?

[johnsoex]

08 5.3 4x2. I get 21 at 70 MPH on the highway and 12-15 city. I have a blower and a bunch of other mods though.

 

[DStockton]

I get about 15 with a 6.2. I think 20 for a big SUV is out of the question

 

[Denkon]

running all highway that was flat with 93 octane I was able to get 22 mpg cruising around 73. The rest of the trip would vary from 15-18 mpg (hills and higher speed aprox 80 mph and sometimes only finding 91 octane)

 

[DStockton]

I think I got 19 on all highway with 87 octane

 

[Sierkonblazer]

Well, I put a Volant CAI on it, put the 17s back on it, replaced all the fluids with Amsoil and running on 89 octane, my wife was averaging 18.7mpg over 2500 miles of 75/25 highway/city driving. Picked up about .5 mpg from the CAI and .7 from the fluid swap. Looking at a tune next to try to reach that 20 mpg mark..

 

[fire730]

I wish my wife would at least get in the 12s in the city with her 07 5.3 all stock with OE 20s.

 

[NC_John]

I got 20.1 and 20.2 from two tanks of fuel (one yesterday, one today) including driving through some ridiculous DC stop and go traffic. (08, 5.3
2WD).

I used to watch the instant MPG display on the dash and try to hypermile. I got sick of it (it was getting to be OCD) and started driving it the way I wanted to and my mileage went up. The truck likes to drive faster, go figure...

 

[Denali0229]

Not possible in my truck that's for sure. My DIC reads 8.1 mpg on the current tank. I've calculated it before and my DIC is pretty accurate. I lose 0.5 mpg if I just sit in my truck while its running for ten minutes. I also lose a little whenever I start it up.

 

[gilbo]

2012 5.3 tahoe
i've been avg'ing 17.9-18.2, i basically drive 21.1 miles each way, 14.8 miles of which is highway. 65-70 mph

 

[felixgun]

I'm currently getting 14.7 in my 5.3L avalanche and 11.9 in my 6.2L Esky.