i got a 2019 1500 Classic 3.0 Eco diesel RWD with 392 rear end and with average 33 to 36mpg, i bought and installed a Box from DTE systems, and a pedal box for the truck, I love it!! i leave the 5.7 gas trucks in the dust at the red lights and not to mention all chevys gas and diesel trucks. the box is installed at the injectors and gives me 40 more HP and 52ft-lbs in torque.Its the best investment i have ever done. the pedal box is amazing, i can adjust settings as i drive or i can adjust it by an app on the phone,