Mine is fairly accurate. WIthin about 3/10ths of a gallon. That also probably has something to do with me rounding up the fuel to the nearest dollar. My fuel guage is not accurate as it says that I am on low fuel after I have burned 15.5 gallons in my 26 gallon tank. Therefore I have checked with the gallons used in the DIC and this has helped me go further knowing I still have plenty left.
2008 GMC 2500HD LMM SLT CC SB 4x4 Z71
Buckstop front bumper, WARN M12000 winch, PIAA 520 ATP driving / PIAA 510 fog, Westin Platinum Series nerf bars, Pace Edwards Bedlocker tonneau cover, Cognito UCA leveling kit and HD Idler Pivot Assembly, Cognito Pitman and Idler steering braces, Bilstein 5100's, LT285/70R17 BFG AT KO tires, 17 x 9 XD Series Crank Wheels, 15% Tint Driver/Passenger windows, GM Tow Mirrors, DDM Tuning HID lights 6000K 35W