olyelr
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Not too bad for a 132 mile average down the freeway. It really flat out amazes me.
Lifetime Fuel Economy - 6.2 liter engine
- Thread starter JWBGMC
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Not too bad for a 132 mile average down the freeway. It really flat out amazes me.
olyelr
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And lifetime fuel economy? Where is that located?
cardude2000
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I just checked again this AM and my (mostly) lifetime MPG is 17.5....Not bad as I do mostly around town driving and when I'm on the highway I hammer it!
olyelr
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Again, where is the lifetime MPG readout?
If you are going by one of the trips that has never been reset, then that is not how it works. I think it only calculates about the last 500 miles or so. You can verify easily... hookup a travel trailer, and after the first tank-full the overall average will drop to about 8-9 MPG.... ask me how I know. If it was truly calculating the entire miles on the trip, it would take A LOT longer to drop that much.
Ksnell
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are these actual numbers of miles driven by number of gallons to fill the tank to the top or just reading the meter on the screen? pretty good numbers
olyelr
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I did not hand calculate that short trip I took a pic of, but wverytime I do the computer is dang close.
Yes, very respectable numbers for a 400+ horse v8 in a large suv. Hard to believe really.
ncpepperman
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Just returned from a 1000 mi round trip to DC on I 81. 67 mph average on trip up with 2 stops , 22 mpg. Return trip was 63 mph and 22 mpg. Only have 2 K on the Denali and very impressed with the mileage. As good as wife's '11 Highlander but a lot more vehicle.
cardude2000
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In your glove-box. More specifically, page 139 & 140 of your manual inside your glove-box.
My manual says:
"The average fuel economy display shows the approximate average liters per 100 kilometers or miles per gallon (MPG). This number is calculated based on the number of L/100km (mpg) recorded since the last time this menu item was reset."
(There is a also a 25/50/500 mile calculator but that is separate from the trip readout.)
Additionally there is a 'FUEL USED' monitor (page 140). I've used 1629 gallons (I've never reset it) over the life of the vehicle. I have 28,500 miles on the truck. That equates to ~17.5MPG.
17.5 is exactly what my 'Trip B' (which has never been reset) reflects.
Hope this helps.
olyelr
Full Access Member
Well thanks for the info! Unfortunately, I guess we have no manual for the vehicle, just some 100 page book about the radio. I will look on-line for one, as I am curious on how to find these numbers.
I dont remember the exact numbers, but I know we had 20K ish miles on her car with the trip that had not ever been reset reading well into the high teens for MPG, and after one tank-full towing a travel trailer it dropped well below 10 average. It was with her '15 SLT, though, not her Denali. Not sure if that works differently.
If you download the GM app you have a full manual there , I don't know if you have Chevy or GMC, try you will like it.
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