Trip Computer Avg Mpg

Tech discussions on the 3.6L V6 motor (LFX) used in the 2012 & up Caprice.
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sardillim
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Trip Computer Avg Mpg

Post by sardillim » Sun Jun 17, 2018 2:20 am

For about the last 6 months i have noticed the avg MPG drop from about 19.5 to 16.5. what was strange is that the drop happened suddenly and it didn't seem like the range per tank of gas had changed. So the last two fill ups i checked the mileage the old fashion way by dividing the miles by the amount of gallons and i found the car is really getting 21.5 - 22.0 mpg not the 16.5 as the trip computer states. So my question is how dose the trip computer calculate the MPG ? Is there some sort of a fuel flow meter ? is there anyway to calibrate this???

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elc32955
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Re: Trip Computer Avg Mpg

Post by elc32955 » Fri Jun 29, 2018 11:19 am

This is interesting. My FSM doesn't cover the V6 cars as it's a 2011 book, I'll have to browse & see how the V8's do it. Should be similar I would think...

Eric
System Manager and your tourguide for the day. Caprice Alumni, former owner of a 2011 Caprice 9C3 with a Rotofab CAI and front radiator cover, 3.45 LSD Camaro rear diff, Chris Henry performance tune, G8 GT 18" Enkei rims w/Holden lions, custom SLP axle-back muffler set with tips, Holden WM Caprice factory spoiler, Holden SSV leather steering wheel and leather shift knob, Whelen Alpha-12Q airhorn amp. G8 GT rear seat swap, AVS Ventshades.

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sardillim
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Location: Easton Ct

Re: Trip Computer Avg Mpg

Post by sardillim » Sat Jun 30, 2018 2:59 am

cool appreciate it

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sardillim
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Location: Easton Ct

Re: Trip Computer Avg Mpg

Post by sardillim » Wed Aug 29, 2018 2:16 am

Update

I have had and engine code for a lean condition in bank 2 long story short i would up changing the fuel injectors which solved the lean condition, and at the same time the mpg is now reading correctly

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