This was done over 2 tanks of fuel.
Usually a tank lasts me over 300miles (without actually going empty)
The diablo tune drained 22 gallons in almost 200 miles.
So the MPG gains are a lie. Fake news lol
That was the whole reason i bought this thing.

Now its got a problem with the brakes where it ...

as you may know, the 08 and later years trucks and SUVs came with electric fans that OE fit older GM trucks & suvs

who here has used the diablo tuner to install & run these fans?

let us know if you ran into any issues.
if you recommend it.
or if the tunner will not do it.


thanks!!

No, im saying these tires have been on the truck since i have owned it.

It got 17 now it gets 12.

I uninstalled the tune so soon we will know of its back to 17.

Point is... it killed my millage.
Probably gonna return it unless i can get a tune that works

The 87 tune killed my mpg


Stock gears.
I changed to 285/75R16 tires immediately.
Stock was 265/75R16

When i do my MPG id add 10% to the odometer and cross reference that number against google maps.

The Diablo tuner now gets me 16mpg highway....
My 1987 4x4 got that

I uninstalled the 87 tune ...

Bump

Stock gears.
I changed to 285/75R16 tires immediately.
Stock was 265/75R16

When i do my MPG id add 10% to the odometer and cross reference that number against google maps.

The Diablo tuner now gets me 16mpg highway.... i wish i didn't sell my old square body :(

I uninstalled the 87 tune and ...

When i bought my truck i was averaging 17
then i moved to CA with terrible quality gas. now it gets 15
now i have the tunner and get 13....

i might return this thing out of frustration. :blowup:
If it bumped the MPG back up to 17 it would have paid for itself in less than a year.



am i doing ...

i did
i like it.

upped the PSI by 3 and dropped the shift time by 1 second.

1-2 shift is now a solid punch compared to before.
i might keep trying other options with 2-3 & 3-4

the main thing i like is telling the transmission how to downshift.... like: to drop to 1st gear, at 40mph, that way ...

am i correct in understanding that i dont get an "MPG boost tune" because my truck is 2004?

so far i am down in MPG... a lot...