2018 Yukon Denali Ultimate 6.2L 10 speed 4WD, 2000 Suburban 2500 6.0L 4WD
Installed 91 Octane performance tune via Flashpaq F5 on my 2018 Yukon Denali Ultimate. AFM is turned off & speed limit increased. No dyno sheets to show but there is way more low end power & peddle response is so smooth. With AFM turned off I got 23.3mpg on a 50 trip with speeds from heavy traffic to 70mph with several stop lights. Easily passes the 111mph factory limit.