[70AARCUDA]

...5% error is what I've found and been posting here.

...and, "No," On-Star™ cannot "flash-update" the BCM (Body Control Module).

 

[70AARCUDA]

...here's how our 2011 LTZ DIC-numbers compare with our gas-pump numbers:

http://www.cruzetalk.com/forum/27-f...ed-dic-vs-gallons-used-fill-up.html#post31075

 

[70AARCUDA]

...regardless of the "method" used, the goal is to consistently re-fill the tank 'each time' to exactly the same:

a) capacity,
b) level, or
c) volume

...so that the MILES-driven versus GALLONS-used relationship has a valid GALLONS number every time.