Re: What the shiz? New firestone destination A/T negatively effect MPG?
What size are the Dest AT's you put on ? I went with same size that came stock with my Overland (245 / 17's), and get over 20 mpg at 65 mph. IF you went with 255's your speedo calibration is incorrect which could account for the difference, plus those tires are heavier.
2006 GC Overland QD II
5.7 Hemi, Modern Muscle 85 mm CNC ported TB, Apexi super voltage stabilizer, Billet Tech. Catch Can, Koni FSD shocks/struts, SRT8 sway bars, Cooper Discoverer SRX 255/65/17, Amsoil fluids, Diablosport Intune CMR tuned by Hemifever tuning.