Fuel efficiency improvements

[atis]

Jaycen,

I am not even entertaining mpg yet...360 miles on a new 350 so I know I need to hit at least 1000 miles before I start seeing any decent mpg. My Mustang was getting 13 mpg highway when new and I didnt make it to 26 mpg till I broke 1200 miles.

The original poster wants improved mpg but hasnt stated what his current mpg is.

 

[Jaycenk]

Jaycen,

I am not even entertaining mpg yet...360 miles on a new 350 so I know I need to hit at least 1000 miles before I start seeing any decent mpg. My Mustang was getting 13 mpg highway when new and I didnt make it to 26 mpg till I broke 1200 miles.

The original poster wants improved mpg but hasnt stated what his current mpg is.

Disregard what I posted LOL It was late and I missed the fact that there were 3 other pages and didn't even read the first page very well. I would like to say I was drunk when I did this but I can not say that I was. Maybe just a senior moment. Think I will go and have some coffe and metamucil. Sorry about that, I usually don't do that .

 

[atis]

No worries...we all have those late nights where we are trying to be helpful but the day was so long the brain is a half step behind the hands. LOL

Crap, if your already on metamucil I am behind the power curve since I am 6 yrs ahead of you!! Dang it, I knew I was forgetting something in the morning!

 

[Jaycenk]

LOL I age quick. I felt like a 90 year old man at 26. I think I have started back down the slope again though as I feel like I'm about 75 today. lol Maybe in a year or two I will be back down into the 30's where I belong.

 

[atis]

I understand completely...19 yrs in the Marines...my body is broke down pretty bad. On cold mornings I feel around 90 and everything hurts.

 

[rdhenderson]

Swapped out for an MSD cap, rotor and 8.5mm wires as well as Bosch Platinum 4+ plugs. No idea whether it has better fuel economy but it sure runs good. Any other ideas? Any benefit to upgraded coil?

 

[atis]

Not sure. I am getting 17.6mpg during the breakin of the new motor...hoping it improves a little as it loosens up (that was at 500 total miles)

 

[19Yukon97]

wow. your complaining about getting 17 mpg? im getting 14... i would be glad to get 17. the day i get 17 will the best day ever. sorrysorry i seem blunt but i dont get while your so unhappy with 17, when everyone else with these trucks get 10-15.

---------- Post added at 12:10 AM ---------- Previous post was at 12:08 AM ----------

this might help... its a big box of metal... and not enough torque to get it up and going... and not enough horsepower to keep it going... haha put ya some turbos or a supercharger o

 

[atis]

I drive mine like I am driving Ms Daisy...I was getting 18mpg on the old motor (10mpg when towing which is what I am hoping to improve on). She is not raised, stock rims, stock tire size, regular old street tires....so I hope I am getting better then most on here!!

 

[atis]

ok, 1200 miles on the crate motor....new mpg rading.... 18.4mpg...now to figure out how to get another 1.6mpg and I will be happy!!

 

[bouttreefitty]

im getting between 9 and 10 mpg...

 

[lonnel26]

getting around 12-14 but my truck is also lifted

 

[ChiTahoe]

I'm sitting at 9-10 mpg. Can't wait to tune it up and fix the leaking intake...

 

[moviewithnotitle]

I have found the best way to increase mileage aside form what has already been mentioned is:
- Keep the RPM's under 2k at all times.
- Cruise Control on the highway ALL the time! Cruise control alone on the highway saves me gallons of fuel on every trip.
- Find the least traffic path to work. If you can maintain a constant speed, MPG's go up on any driving.
- Removing unwanted weight from your truck. My speakerbox, tools and misc gear alone is just over 200lbs. If you can get away with it, pull the spare tire for even great weight savings.

 

[fyremanpat]

Or a sail!

 

[TahoeJim]

I have found the best way to increase mileage aside form what has already been mentioned is:
-If you can get away with it, pull the spare tire for even great weight savings.

That 100 pounds on a 6000 pound truck isn't going to make any measurable difference in mileage. Getting a flat and not having a spare would make for a real crappy day..or night.

 

[ARTEMIS1759]

Ok I'll reply. For a baseline on a 2 door 4x4 350/4L60e 3.42 with a true dual straight thru exhaust and Cold Air Intake I got around 18-20 on the highway. Not sure in town. Probably 12-15. It also had 31x10.50x 15 someone else installed. I am getting about the same with the same engine and stock air cleaner and cat back straight pipes with 2003 Tahoe 17" wheels and 245 tires in my 1993 Tahoe I replaced the Yukon with. On the hiway In 4th gear I get better mileage at 2000 rpms at 75 then driving between 55-65. Not sure why. In 180 miles i use roughly 3/8 of a tank at 75 versus 5/8 tank at around 60. Tune-up is the biggest thing.

 

[jeff sanford]

99 2wd, 245-45-20's and I only get 12mpg city/ 14mpg hwy. I would love to be in the 17mpg range.

 

[atis]

I am still pulling 17.5-18.6mpg now with 3,200 miles on the new motor....but the occassinal hard start is back.... dang it.

 

[blackandcamo]

1997 2 dr 8 inch fabtech lift 325/65r18 tires 3.73 gears helix throttle body spacer bosch platinum 4 k&n cold air intake shorty headers straight pipes hypertech programmer and msd coil and i get 9 mpg