ANOTHER MPG thread? Yeah! Why not!?

[adrianb]

I know this has been beaten badly but I am wondering what everyone else is seeing for their actual MPG?

I have a 2003 LT with the 5.3 motor, bone stock except for a KN air filter. I drive almost 100% in town and the display has been showing 10 to 11 mpg, my hand calcs indicating slightly less than that I regularly see people claiming 14 mpg, is that what I should be expecting? I think I drive pretty conservatively, I don't race or step on it if I can avoid it.

The truck has 80k, I bought it used with 50k and had a complete tune-up at the time (belts, hoses, plugs, wires, all fluids and filters).

Things I have recently done/checked:
oil changes per the idiot light
tires are new, inflated to 35 psi all around (checked when cold)
cleaned the KN filter
cleaned MAF
cleaned throttle body
just switched to Chevron fuel (87 octane) from the grocery store brand (also 87 octane)
added some Lucas product to the fuel last 2 fill-ups
added half a can of seafoam to the crank case last night
I also disconnected the battery for a couple hours to let everything "reset"

So far, I haven't seen anything make a difference. Is there anything obvious I am missing that I ought to try? I compared notes with a co-worker with a 2004 AWD version, her truck claims 14 mpg but she admitted she hadn't reset the reading since buying it new 7 year ago LOL.

I am not expecting 16+ mpg but even 12 mpg is going to be a ~20% increase and sounds in-line with what other people are getting. I am nearing single digits.

I would love to get a Blackbear tune but I just don't have the $300 to spend right now.

Any other thoughts or suggestions you all might have would be greatly appreciated.

Thanks all, loving the forum.

Adrian

 

[2005yukonxl]

everyones "in town" driving varies as well. lots of stop signs and sitting in traffic will eat it up fast. just slwoing down and turning and accelerating over and over will do it too. good luck trying to squeeze a bit more out. probally wont happen unless u drive like a granny or stop stopping at red lights and stop signs

 

[adrianb]

everyones "in town" driving varies as well.

DOH! Thanks for the reminder Sir Yukon, I edited. I meant to include that I drive like a grandma too. My wife hates it, she has a lead foot.

 

[blueflamed03]

different altitudes, habits, gears and tires, etc...I get 12 on a good day.

 

[2005yukonxl]

if it makes u feel better, my "in town" driving at work has been netting me about 6mpg consistantly. it drops once in a while, mainly for sustained speeds above 140 but those are far and few between hahaha

 

[dwmmatt23]

, thats what im getting as well, it sucks but it is what it is. Thats after it went up with complete tune up, new cats and O2's

 

[Gordy]

It is what it is

01 completly stock 5.3L. 4wd. 10-11 mpg in town. winter was 9-10 mpg in town.

New plugs at 125k = no change in mpg.

New plug wires at 125k = nochange in mpg.

Seafoamed intake at 125k= No change in mpg.

Changed to mobil 1 full synthetic at 125k = No change in mpg.

Cleaned egr valve at 125k because it threw a code= No change in mpg.

Cleaned MAF at 125k = no change in mpg.

Seafoamed tank a few times = no change in mpg.

Using 2 cycle trcw or what ever in the fuel tank at 1 oz per 5gal = no change in mpg.



The bottom line is a heavy suv with a less than steller 5.3 power to fuel consumption ratio........stuck with the mpg.

 

[dwmmatt23]

01 completly stock 5.3L. 4wd. 10-11 mpg in town. winter was 9-10 mpg in town.

New plugs at 125k = no change in mpg.

New plug wires at 125k = nochange in mpg.

Seafoamed intake at 125k= No change in mpg.

Changed to mobil 1 full synthetic at 125k = No change in mpg.

Cleaned egr valve at 125k because it threw a code= No change in mpg.

Cleaned MAF at 125k = no change in mpg.

Seafoamed tank a few times = no change in mpg.

Using 2 cycle trcw or what ever in the fuel tank at 1 oz per 5gal = no change in mpg.



The bottom line is a heavy suv with a less than steller 5.3 power to fuel consumption ratio........stuck with the mpg.

What he said

 

[Bedore]

I have been calculating my mileage. I am getting around 13.2 in town, and 15.7 on the highway.

 

[Phantomx55]

my hoe says 13.5 mpg since I got it last june, I thought mine was pretty bad, but I guess not compared to most other people here..

 

[07Burb]

if it makes u feel better, my "in town" driving at work has been netting me about 6mpg consistantly. it drops once in a while, mainly for sustained speeds above 140 but those are far and few between hahaha

Apples meet oranges

 

[slowstang305]

02 6.0 When driven with a little bit of a lead foot it is showing me 12.2MPG in the city. Then I started driving like grandma it went up to 14.6 in the city. Haven't done any real highway testing just yet. It looks like the computer is calculating your MPG even when you are stopped at a light and burning fuel. This means if you run into traffic alot, your MPG will be far less then that of others.

 

[2ATA]

I've got an 04 Tahoe 4WD with the following:

BullyDog GT Tuner
AFE Stage 2 intake
Trans Dapt TB spacer
Electric Fan conversion
Magnaflow catback
111,000 miles

I average 16mpg. No granny drivin.