2015 GMC Yukon XL Denali MPG (6.2L, 8-speed)
We did our first road trip last weekend in our new 2015 GMC Yukon XL Denali with the 6.2L and the new 8-speed transmission. Towed my brother's boat to AZ, no trailer on the return trip. And I was real...
Forum Discussion
Just a note on premium and the DIC on my CTS. My hand calculated mileage is higher than the DIC when using 93 octane instead of 87. This is on the 2.0 Turbo. I believe that my butt-dyno does say that premium is better, and the Shell station sells 93 octane for $.20 more than 87. The mpg is about 1.5 better with 93 octane.
