Im getting about 21-22 mpg on my 3500 SRW and I have just under 2000 miles on it. I get easily 600 miles to a tank.
2017 Chevrolet Silverado 3500HD SRW High Country CCSB L5P Duramax
Cognito UCA kit, Truxedo soft tunnel cover, 18" Novakane's death metal wrapped in LT275/70R18 Nitto Ridge Grapplers
2008 Chevrolet Silverado 2500HD CCSB Z71 LTZ LMM Duramax SOLD
EFI Live from Underground Diesel, FASS Lift Pump, PPE Tie Rod sleeves, Cognito UCA kit, Fuel Throttle wheels wrapped with 285 70 17 BFG ATs, Banks Ram Air Intake ATS Diff Cover & Deep Tranny Pan, 5" Diamond Eye DPF DOC delete, EGR blocked, N-Fab Stainless W2W Nerf Bars, Dux Billet Grille Insert, EDGE Insight CTS2 w/ EAS turbo timer and camera, B&W Turnover ball gooseneck with Firestone air bags, Truxedo Tunnel Cover, New Mexico Diesel Place Member #18