Wow 19.6mpg in a heavy crewcab 4x4 with 4.10 gears.
I just went from 13.16mpg up to 15.2mpg, and I thought that was good for a 6.0L.
I'm not really sure what was the major factor in the mileage increase. It must of been something to do with the new cats (old ones were plugged), lowered the truck, took off the bumper and hitch, and adjusted the DFCO settings.
I just installed LS1 fans this weekend, so have to see if they help any.
I've also been thinking about getting an airdam extension, like the 05+ trucks. Then there also the turbo I plan to install in the future that should be good for 2mpg+, and i'm only doing it for the mileage, REALLY.

BTW that 2mpg increase saved me $10 a week at the pumps.

 

What do you guys think about using 10w30 vs 5w30.
Last time I changed my oil I just used the oil out of the tank at work, I didn't think about at the time, but the we buy 10w30 at work. I used to have a little piston slap when it was cold, now I don't notice it at all, and not as much valvetrain noise.
The other apprentice at work, drives a 98 GMC with a 4.3L in it, and it has a bad case of piston slap, now I’m talking it sounds like it ran out of oil, you can hear it 100 ft away. I told him try the 10w30, he was using 5w30, so now his engine only knocks for a few seconds, instead of minutes.

 

1/2 ton crew.If I was reading this post I would be thinking,ya ok a lot of folks fudge mileage ,HP, there dick size ... But since I seen it and double checked it and for less than 2000 mile on this new truck,I say wow.Having the OE computer calculating the mileage has changed the way I drive,I let off way earlier coasting more,feather foot from stops and keep the speeds down(when mileage is the goal).Ive have turned into an old man.The 4.10s is the part that gets me.I am sure if i went 70+ the economy would nose dive.These new truck with the closed off frontends electric cooling fans and light tires has to be the biggest part of the gains.
Black 02,good job on the gains

 

I'm impressed with the milage I'm getting so far with my 06, 1500, 4.8 auto, 3.23 ratio. It's only got about 2800 miles on the clock so far but the last 3 tanks (30 gals each) have netted, 20.7, 19.2 & 19.08 mpg at 79 mph-the last two fills with lots of headwind too. Of course this is basically all highway but I have to say I'm pleased. Its no powerhouse for sure, but I'll stick with it for the milage......

 

30 gallons each??? Do you have a special gas tank?
Where are you putting the extra 4 gallons of fuel?
Majority of the 1500 series trucks only have normal 26gal tanks.

Jim

 

mine is 23 gal..


oh btw i get shitty *** gas mileage.

 

You got that tune yet slacker?????
I've had mine removed for two months now. It doesn't get near as good of an average as it did with the tune. 15.0 vs 17.0.
Though today on the way home, I wanted to go a head and check my Hwy mileage without the tune. I set the cruise at 66mph, A/C on, windows and tailgate up. Got a best of 20.8 mpg for apprximately a 26 mile trip. That was from work (Downtown Houston) to my house.
Not too shabby! Though when I'm in morning rush hour, it will average about 15.0. It will stay there on the average with my bad driving habits. (SPEEDING)
With the Nelson tune, I was averaging 16.5-17.0.
Until I get all my bolt-ons, I will just have to eat a loss of 2mpg average.

Jim

 

Regular cab long beds have 34 gal tanks.

 

Never see anyone here with a 1500 series single cab long bed!

Jim

 

Well, don't know what to say.. It's a WT, cheapo 1500. Not quite as plush as my C6 for sure...