13.4-13.7 mpg.... any suggestions

[Cdup]

I bought the truck as is but deleted the muffler on the 4" banks exhaust she came with and straight piped her. She's lifted and i put on new 35x12.5x20 on her. She had the edge evolution, k&n intake but plan on changing the k&n over to the 6637 asap. Looking to change the edge over to stock when i order my tw chip and using the edge as gauges. Hopeing to get better than 13 after i chip her. I drive her like a old pawpaw never really going over 1500 rpms around 55 where i live. Would the chip raise my mpg's and is there anything else i can look for to help it ! (oil, and filter change along with fuel filter also was done on her) Thanks for any replies !!!

[dentexpowerstroke]

Check for boost leaks and up pipes leaking. Usually 2 big causes of lower mpgs also if ypur speedo isnt calibrated you're actually getting a little better than you think

[Cdup]

13.4-13.7 is hand calculated ! When u say boost leaks you mean leaks around the turbo connections. Checked and found the clamp on the downstream of the turbo on the 4" down pipe slightly loose so i snugged it up. Tks ! Side note tires are at 65 psi .

[Schnot]

You're tires are bigger so the speedo needs to be calibrated to match your actual speed. The mileage will not be accurate either. Use a GPS to calculate your actual mileage.

The pipes that come up tithe turbo from the exhaust manifolds are known to leak exhaust pressure. Look at the collector at the back of the turbo and you'll see black spot marks on the pipes if they are leaking. Also check the manifolds. They seem to come loose too. Just make sure they are not rusted through before you try and torque them. Get new ones from for if they are rusty.


Sent from my Autoguide iPhone app

[Cdup]

I checked the speed with a gps and i'm around 3-4 miles per hr off from the dash so i actually drive at 50 to achieve under 55. I really didn't see any signs on the pipes of the turbo anywhere after tracing them and checking them.... but will look into the manifolds... thanks !

[SS4Matt]

my speedo isn't corrected for my 35" tires. I have the typical mods, 6637, chip, 4" turbo back exhaust. and my truck only gets 13-14 with city driving. now if I get on a stretch of interstate heading up north for a weekend I usually see 18-20 mpg

['01SilverBullet]

For the lift, wheels and tires, I'd that mileage sounds about right for daily driving. A chip could help with mileage a bit though...

[Turbostang500]

Originally Posted by Cdup

I checked the speed with a gps and i'm around 3-4 miles per hr off from the dash so i actually drive at 50 to achieve under 55. I really didn't see any signs on the pipes of the turbo anywhere after tracing them and checking them.... but will look into the manifolds... thanks !

If your off by 3-4 mph, you need yo recalibrate your speedo.

You are traveling more miles than your registering.

[Flatbedcowboy]

Heck with winter fuel that fuel milage sounds pretty good to me!

[7.3550Duty]

Yeah no kiddin, i would be happy with that mileage. You gotta think thou man, your rolling 35's, thats alot of rolling weight mass, your up higher in the air, which is wind resistance. Thus in return takes more power to keep goin that fast. Its just a chain reaction, be happy with your mileage. Its not too bad for a 8000lb truck.
As for your gauges, throw that edge in the round can and get a good set of gauges to monitor your stuff. Nothing worse than having the improper reading from a edge programmer. Go out and get the autometer or something along them lines. Install the sending units in the proper locations for like your trans temp and egt probe in your exhaust manifold.