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2018 Yukon Denali Ultimate 6.2L 10 speed 4WD, 2000 Suburban 2500 6.0L 4WD
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Discussion Starter · #1 ·
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.
 
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