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Discussion Starter · #1 ·
i have a straight pipe and efi on my lmm, just trying to figure out if my CTS is off. it reads im getting 21mpg-25mpg depending how i drive, but i hand calculated it to 16.7. if this is off, are the rest of my numbers on the cts off?
 

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As far as I know the CTS just reads whats in the ECM of the truck.
I thinks the Truck is inaccurate.
 

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Discussion Starter · #3 ·
The truck Dosnt tell me fuel mileage. No idea why. I either have to hand calculate ir the cts. So you think the cts is correct?
 
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