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I haven't check that specifically, but I have noticed that the MPG calculation is if off compared to manual calculation (tank up, set trip odometer to zero, tank up, divide the odometer miles by the gas put in).
I have checked about five tanks now, and the variation has been between 99% to 90% (the computer being more optimistic).
In my previous 2011 Cruze, I checked it about seven times and it was around 97% each time.
 

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Both of mine (2012/2016) have consistently been 1.5-3 MPG off the manual calculation.
Its just odd that Gen 1 was consistently off 97%, but Gen 2 varies 90% to 99%.
At least with Gen 2, if I assume the 90% all the time, my MPG for my commute is still better than Gen 1 at 97%. (39 mpg vs. 37 mpg) so even if the computer is off, Gen 2 is still a better car MPG for my driving.
 
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