1999 GMC Suburban K2500 DD

[LT7A]

Thanks for the link and the info. I think you mentioned a 411 ECU. Would that provide tuning advantages? 13.6 MPG sounds pretty dang good, especially all loaded up. Did you have to wait til black bear came to your area to do the tuning?

[OutlawDrifter]

Originally Posted by LT7A

Thanks for the link and the info. I think you mentioned a 411 ECU. Would that provide tuning advantages? 13.6 MPG sounds pretty dang good, especially all loaded up. Did you have to wait til black bear came to your area to do the tuning?

0411 is a faster running ECU. Gives more tuning options such as Tow/Haul mode, E-Fan control, the ability to run coil on plug ignition, etc.

Blackbear tune was ordered online, I used their "canned tune". You have 2 options, send your ECU in, or order another. I opted to order another so I would have my stock if needed. Yes 13.6mpg is pretty good for a big block 3/4t 4WD 'burb with the aerodynamics of a brick!