MPG increase help

[puckhead]

Once you do get it figured out, i would look at getting a CAI. It is a rpetty big truck to move around too. but 10 is low

 

[Mr. B]

A scan cable tune from Blackbear would 1) improve your mileage, and 2) let Justin look at your pre-tune data to see if he can help narrow it down. You have to give a couple deposits to him, but in the end it is only like $250 for the tune.

 

[mikeb33]

I just got back form a 2,500 mile trip. I averaged about 16mpg. I was doing 80-85 mph for a great part of it, and maybe 300 miles of around town driving in there too.

 

[BC Lightning]

A scan cable tune from Blackbear would 1) improve your mileage, and 2) let Justin look at your pre-tune data to see if he can help narrow it down. You have to give a couple deposits to him, but in the end it is only like $250 for the tune.

Data is power!! I would data log it to see what everything is reading. Check timing, fuel trims, spark, etc.

10 is way too low, even if you had your foot smashed to the floor every time you got in

 

[phileaglesfan]

I would guess something in the fuel system. Maybe a clogged filter (if these even have one).

 

[dabeech]

Fuel filter is in the gas tank. Cleaned the TB and MAF this weekend. So we will see what happends. Running Lucas fuel injector cleaner thru the tank too.

 

[dabeech]

Anyway to test a o2 sensor to see if its bad?

 

[stevek]

My Denali (6.2) sucks up gas... going by the trip mileage and how much I put in at the pump I'm averaging 10mpg at best. I stopped gassing it unless necessary, accelerating slower, etc but not much better. Should I use Premium or Regular?

 

[Fast55]

Being a 6.2 like my Tahoe or an Escalade, you should never use less than mid-grade or 89. Tune it and it'll help.