2007 Suburban 8 MPG HWY??!!

[FamilyGuy]

Yeah, 6.0.
That's my next option, getting it checked at my local shop for anything I may be missing.

---------- Post added at 01:02 PM ---------- Previous post was at 01:01 PM ----------

You should also look into a tune from Blackbear----a vendor on here. I have a shorty Yukon but with the 6-0 and I get 19-21 on the highway with their 91 OCT Tune. Besides better fuel economy(if you are not heavy on the pedal)-a tune really wakes up your vehicle....

I've been considering that also.

 

[yates ™]

Was it motor swapped or am I missing when a 6.0 was put in an 07? If it was swapped that could be part of your problem.

 

[FamilyGuy]

Nope. Stock.

---------- Post added at 01:11 PM ---------- Previous post was at 01:10 PM ----------

While I was shopping, I did find a few 07s with the 6.0

 

[yates ™]

Wait a minute, thinking back the 2500's did come with a 6.0. Is yours a 2500?

 

[FamilyGuy]

1500.
That may be odd. Maybe I should check my VIN and verify again.

 

[BirchyBoy]

The TrailerLife guide lists a 2wd with 6.0 and 4.10 gears as an option that year.

http://www.trailerlife.com/wp-content/uploads/2012/01/Trailer-Life-Towing-Guide-2007.pdf

 

[FamilyGuy]

Yeah, I was second guessing myself, but I do remember going over the previous owner's paperwork and seeing the specs.

 

[yates ™]

The TrailerLife guide lists a 2wd with 6.0 and 4.10 gears as an option that year.

http://www.trailerlife.com/wp-content/uploads/2012/01/Trailer-Life-Towing-Guide-2007.pdf

Well I guess I learned something today. Carry on.

 

[njracer]

I'm jealous, NJ.
New plugs; got 12mpg. On the same Flat trip.
What engine do you have?

I have the 5.3 in my Z71 4wd.

 

[FamilyGuy]

I took it to a shop to see if they could find anything wrong.
I notice a slight (so slight, it may just be in my head, due to this MPG ordeal)
They suggested I use sea foam. Since the spark plugs hadn't been replaced since new.
Also, this the previous owner replaced the transmission.

Any advice on this and the seafoam stuff, is appreciated.