2010 Denali/Mileage Question
- Thread starter thebull12
- Start date
Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
because your pushing the big pedal, try granny style @55 and minimal braking, ease on the pedal like you are going to take all day to get up to speed. coast whenever possible.
other than that these are not "economical" vehicles if you are concerned about mpg go by a prius
swathdiver
Full Access Member
'Cause you drive it like you stole it?
Or you sit outside the grocery store for 5 songs idling while your wife runs inside for, "just one thing"?
On a serious note, what are your expectations?
Marky Dissod
Full Access Member
Even if it is not an XL, it still weighs at last 5000lb. (XLs weigh closer to 6000lb.)
If using 87 instead of 91, MpG will decrease. How much does ethanol cost compared to 87?
Unless towing / hauling heavy, 50% 87 octane with 50% ethanol works grreat!
(If towing / hauling heavy, use 67% 91 octane with 33% ethanol.)
Wait a sec: do you use ethanol? Ethanol ALWAYS gets worse MpG compared to petrol,
even though it may very well get better miles per DOLLAR, depending on prices of 87 vs ethanol.
Ethanol also burns cleaner and improves emissions, so even if miles per dollar is same as petrol,
in the very long run, your engine comes out ahead.
Are you leadfooted? Leave earlier, and lighten up on the go-pedal as much as you can stand it.
If EVERYONE is passing you, you're getting better at it. (Bonus points for slowing others down.)
Coast as much as reasonably possible, pretend there's something wrong with the brakes,
and see if you can get better at approaching red lights just as they're about to turn green.
Don't idle in Neutral / Park unless the heater / AC is needed.
Hypermiling: the art of driving to save enough petrol to piss off everyone else so profoundly,
that they waste THEIR petrol instead of your time. Did I mention, leave earlier?
How old are your O2 sensors / spark plugs / wires?
Is your air filter clean?
EDIT: forgot to mention:
Are you using 10W40, or 5W20?
How old is your axle gear oil / differential fluid / ATF?
How bad is your alignment?
Are any of your brakes dragging?
Last edited:
Something's wrong, you should be getting a lot better mileage. Our 2014 with the same L94 averaged 17.2 MPG until I deleted the AFM/DOD at 142,000 miles. (After the delete, running the Diablo sport economy tune, we're at 168,000 mi with an overall average of 18.8)
How's your air filter? Spark plugs? Any codes stored? If the basic stuff checks out, I'd throw a new AC Delco camshaft position sensor in, and crankshaft position sensor. They are known to go bad without throwing a code. The L94 does not get good mileage from the AFM/DOD system.... It gets it from variable valve timing, which depends on the camshaft position sensor to work properly. (Which works in tandem with the crankshaft position sensor) With its ability to retard camshaft timing at lower RPMs, you make a lot more torque which equals more efficiency right where you need it, at cruising speed. That's my guess anyway
How's your air filter? Spark plugs? Any codes stored? If the basic stuff checks out, I'd throw a new AC Delco camshaft position sensor in, and crankshaft position sensor. They are known to go bad without throwing a code. The L94 does not get good mileage from the AFM/DOD system.... It gets it from variable valve timing, which depends on the camshaft position sensor to work properly. (Which works in tandem with the crankshaft position sensor) With its ability to retard camshaft timing at lower RPMs, you make a lot more torque which equals more efficiency right where you need it, at cruising speed. That's my guess anyway
Lol, what about me...
I get 9.6, what's your synopsis I wanna hear this one
Marky Dissod
Full Access Member
If you were any more leadfooted, you'd be thorium-footed.
I'll add the vehicle runs perfectly the tires are inflated properly and transmission is in good working condition, spark plugs/wires have about 10k on them or less and I use 93 octane
Did you forget you've got 15 bags of cement in the trunk? LOL.... Must have a serious leadfoot?
.... So something's definitely off. We use 92 octane on long road trips, like the 900 miles to Vegas and it nets us 20 MPG. I'm wondering if you're getting close to having the catalytic converters plugged. Maybe not enough yet to set the code. How old is the muffler? Did the plugs look good when you changed them? Wouldn't hurt to plug in and check the fuel tables and such...
My 14 on the window sticker says 13mpg city/ 18 mpg highway.
That's certainly a pipe dream of the OEMs.. as that's tested at ideal conditions
on a NEW vehicle. When I was totally stock I got 17.2 hwy. With DOD just
disabled I got 17.0 !!!!
So if your driving in urban/suburban traffic 13 is pretty normal ish
Do the maint as suggested above and make sure your tires and alignment
are "right"
That's certainly a pipe dream of the OEMs.. as that's tested at ideal conditions
on a NEW vehicle. When I was totally stock I got 17.2 hwy. With DOD just
disabled I got 17.0 !!!!
So if your driving in urban/suburban traffic 13 is pretty normal ish
Do the maint as suggested above and make sure your tires and alignment
are "right"
City Or Highway ??? what kind of driving and temps and where ????
My wife’s 2013 Denali XL averages between 14 & 15 mpg. She does a fairly even mix of highway and city.
This is right online with what we got on our 2007, 2008 Denali XL’s and our 2009 Suburban.
This is right online with what we got on our 2007, 2008 Denali XL’s and our 2009 Suburban.
Yep ding ding, it's all about the bid pedal same for the op
Cats are new less than a year old each, it's none of the above, it's just how I drive. I can take a brand new one off the lot and get the same mpg
petethepug
Michael
2010 YXL Denali with fire breathing 6.2L?
13 MPG is good. Did you end up transporting it or flying out to get it?
Your milage is great. 2011 may have an instant milage calculator and average trip calculator. If you want to know what highway mileage is just reset the milage calculator while you’re at highway speed.
fueleconomy.gov
13 MPG is good. Did you end up transporting it or flying out to get it?
Your milage is great. 2011 may have an instant milage calculator and average trip calculator. If you want to know what highway mileage is just reset the milage calculator while you’re at highway speed.
Gas Mileage of 2011 GMC Yukon
Search by Model. Search by make for fuel efficient new and used cars and trucks
fueleconomy.gov
- Joined
- Aug 2, 2018
- Posts
- 10,284
- Reaction score
- 14,888
My 2007 Yukon XL Denali averages 10-12 mpg in the city (occasionally dropping below 10), 14-16 mpg on the highway, and 18 mpg on the highway with my wife sitting next to me. 
I run 93 octane exclusively.
Like @Doubeleive , I drive it like I stole it. Otherwise, it is no fun.
I run 93 octane exclusively.
Like @Doubeleive , I drive it like I stole it. Otherwise, it is no fun.
Last edited:
donjetman
Full Access Member
- Joined
- Oct 22, 2018
- Posts
- 1,976
- Reaction score
- 3,618
stock 07 Denali w/199k miles, premium fuel
18-19 hwy
15-16 locally (no city driving or unnecessary idling)
18-19 hwy
15-16 locally (no city driving or unnecessary idling)
