Stock mpg vs custom tune mpg

[Deadeye_88]

I'm doing an experiment om my truck trying to figure which mpg I get and so far I'm getting way better mpg on my stock tune. 13mpg in town whereas on my custom Eco tune I get 11mpg in town. Why is that? I've read and heard that you get better mpg with programmers/chips on a diesel truck but I'm not. And I'm using the same driving conditions. Thanks

[colo_dually]

You're using the wrong tunes. Most experience the mpg gains on the high HP tunes, and keeping out of the throttle. I averaged 13.3 gal on stock tuning, with the Street tune I run its 14.6. I think if you run the performance tune, you'll see what your looking for.

[Deadeye_88]

I can either run the innovative race tune or the performance tune or the Eco tune, Ill still get 11. I just can't get above 12 for some reason. My boss has the same tune but his is a 2006 and he gets 12.5-13mpg in town.

[QMartinez]

Mine does better around town with the stock tuning, but once I get on the freeway the higher the hp the better the mpg. Especially in hilly terrain or with strong winds. The higher power doesn't seem to work as hard.

[Deadeye_88]

Makes sense on the power and all. I wonder what kind of mpg I'll get towing a boat and a travel trailer on stick mode?

[smokersteve]

Originally Posted by colo_dually

You're using the wrong tunes. Most experience the mpg gains on the high HP tunes, and keeping out of the throttle. I averaged 13.3 gal on stock tuning, with the Street tune I run its 14.6. I think if you run the performance tune, you'll see what your looking for.

Then why do they all make a tune called "ECO".

[colo_dually]

Originally Posted by smokersteve

Then why do they all make a tune called "ECO".

Marketing... The economy tunes all have less HP than the performance tunes, and less fueling comparitively. They therefore are also safer than a performance tune. But all the research I've done, and what I'm seeing with my proformance tune, shows me the high HP tune with a disiplined foot is the way to go.

In town, I still get better mileage tuned. But all lot of it is how you drive, I stay under 2200 rpm and 8 lbs of boost. Anything over that and I start to suffer in city.

On Edit:
Here's what I've seen with my IDP tunes: (all the same route and driving habits as possible, 65/35 highway/city combined.)
Stock - 13.3 MPG
IDP - Street - 14.6 MPG
IDP - XRace - 15.3 MPG

[smokersteve]

Originally Posted by colo_dually

Marketing... The economy tunes all have less HP than the performance tunes, and less fueling comparitively. They therefore are also safer than a performance tune. But all the research I've done, and what I'm seeing with my proformance tune, shows me the high HP tune with a disiplined foot is the way to go.

In town, I still get better mileage tuned. But all lot of it is how you drive, I stay under 2200 rpm and 8 lbs of boost. Anything over that and I start to suffer in city.

Then would it not be better to use a high hp tune and cut the throttle map in half, adjust the trans and call that an eco tune?

[Deadeye_88]

On the hwy with a race tune empty with no wind nothing, cruise on 70, I get 15mpg. Which I think is way to low.

[smokeless]

I get better mileage running Matt's 8k tow tune than I do running his SRL tune. I drive both of them the same way but for some reason my truck likes the tow tune better.