New Wheels effect on MPG's

[warriormagee]

Thanks all. I do drive a lot of highway miles, and avg somewhere between
75-80 mph.

 

[Zed 71]

^ 75-80 mph 07 Yukon XL at 21 mpg... How are you calculating mpgs?

 

[warriormagee]

Using the MPG display on the dash.

 

[HitandRunDriver]

Is that instant economy or lifetime economy?

 

[baron]

Defiantly will go down in MPG's and I'm not sure how much a tune is + all the other little things to do to get closer to "normal," but you always have to think to yourself if there will be sufficient return on your investment (unless you don't really care about that, which, in a truck like this, a lot of people don't).
This is a handy calculator:
http://www.fueleconomy.gov/feg/savemoney.shtml

 

[warriormagee]

I'm in Southern Arizona, and I re-set the lifetime meter before I take long trips to places like Phoenix or Los Angeles, CA. It's a 3.5 - 4 hour trip to Phoenix, and about 8 hours to where I go in Cali.