Better MPG with 91 or 87... I forgot...

[Stl_Denali]

I should knoe this, but I have been running my custom 91 tune for over a year now and forgot.... I couldnt find a straight awnser searching either.

With Primium gas hitting $4... would I get better Gas Mileage using the 87 tune? Ive been using the 91 and I have adjusted the parmeters on it and only get 12.7 (though it hauls balls).

Thanks for the input.

05 GMC Yukon Denali, 6l v8.

[Stevens07]

Wow, thats horrible mileage for the LQ9 motor. Are you dialed in with your LTFT's?

And I'd run the 87 tune,.. dial it in.. and pray for the best.
Good luck
Steven

[jcbst12]

Dial it in again. Something is off.

[Stl_Denali]

Cool.... I will add the 87 tune and check the LTFT