I'm sure this has been discussed before, but I was wondering what you all think are good mods to help improve gas mileage. Obviously when we mod our trucks, our right foot gets a little heavier, but putting that aside, are there any mods that will improve gas mileage, even the slightest bit? My truck is horrible on gas, it gets 16mpg on the highway which is terrible, even for a truck, and around 13mpg in the city, and I am VERY light on the gas. My truck is pretty much stock, I've been avoiding modding it for a few months, but if there is something I can do to make it more efficient on fuel then I am all for it. I did Seafoam it a couple months ago which did nothing. It has almost 80k miles on it.

 

I'm getting 24 on the freeway with my 4.8

Wheatley tune, fans, drop in K&N, shift kit . . . everything else is stock

Keep your tires aired up, that makes a huge difference.

 

Push your tire pressure up to 40psi, efans, good tune, quality fuel,make sure the vehicle is in good shape tune up wise. 80K should be good , but you could pull the plugs, clean them and ohm your plug wires, cheak your exhaust backpresure. A shift kit will help round town milage if you stay out of it. It clicks off part throttle shifts quicker. You can do better, I get better than you and I have a turboed 6.0. Good luck

 

TUNE first and foremost

E-Fans and UD pulley will help would probably be next.

 

TUNE TUNE TUNE..im getting about 100 more miles to a tank after getting my tune.i was getting about 10 miles to the gallon before i got the tune in the city..and about 15 on the highway..

 

i have a tune, e-fans, cai, shift kit, 40 psi in tires, new plugs, new wires....and i STILL get 17 MPG

My mileage hasn't improved at all. I drive like a grandma too. I set the cruise control every chance i get.

 

this must be at 55 going down wind.

 

All of the listed ideas are exactly what needs done. But the most important thing to me is to make sure your fuel system, inake and heads are as clean as they can be. Burning good gas helps prolong this but it's hard to keep the injectors up to max efficiency.

I just had my truck tuned (by Nelson a simple mail order 89octane tune, very nice thank you) 2003 1500HD CCSB 4WD a fat 6600 lbs. So it has the 6.0, 4L80E and 4.10's. My best mpg ever, trying the hardest I possibly could, was 14.5mpg at 55 mph, and my combined ave was barely over 10mpg.

I just made a 5hr trip one way with the truck and I put in 20 oz. of Lucas oils fuel system cleaner. (you're only supposed to use 8 oz.) Most of the driving was 70mph, and the winds were pretty calm, I averaged 15mpg. Before the tune and cleaning the injectors that would have been 11 maybe 12 mpg. Now on the same roads driving that 55 mph I can get right around 18mpg. I think the tune was worth about 2-3 mpg and cleaning the injectors was about 1-2 mpg.

I would use Sea foam, Lucas oils, or some local stuff we have called PB Blaster. And I always use two to three times what they recommend. From there do your best to buy cleaner gas. If you do the math the amount you pay to clean your injectors eats up almost all of the fuel savings from increased mpg. So you're damned if you do and damned if you don't. I feel better any way because I'm doing my best to cut down on fuel conusmption in some small way. Good luck.

 

I have yet to do this and can't comment on its validity, but I see that you have a sound system; people say doing the 'Big 3' helps gas mileage

what gears do you have? 4x4 or 2wd? i get 20 mpg going 80-84 mph on the highway but i have 3.42's.

 

It's a 2wd with 3.73's I believe. It's at 2000rpm at 70mph. When i got 16mph I was going 80mph most of the way on the highway, it was a 100% highway trip as well, no city.