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Thread: Avalanche mpg [Expired Topic]
09-24-2010, 07:32 AM #1
Avalanche mpg [Expired Topic]
Just wondering what my fellow Avalanche owners are getting for mpg.
I recently started bringing my son to school, it's all back roads and only about 3 miles away. I had reset the fuel economy gauge and it's only reading mpg of about 11.4 max. I'm very light on the pedal and I'm not carrying any extra cargo other than myself and my son.
The only thing that's not "usual" is that the tonneau cover is off.
Now according to the original sticker it should be getting 14 city 18 highway.
But I'm getting about the same mpg(slightly more) as I get with my 2500 burb with a 7.4l engine.
Something just seems not right. There's no check engine light, it seems to idle and accel properly, no flat spots etc. It does have about 75k miles on it, and it's just recently indicated that it's due for an oil change.
So the best numbers it's gotten are 11.4 city, and 14.6 highway. But I can't really say the conditions for the highway driving since it's my wife who's usually driving it on the highway. From experience she's kind of heavy on the pedal when she drives so I'm not sure that the highway mpg is a true reflection of the best possible number.Patrick
09-24-2010, 07:40 AM #2
I had to drive my Buddies when i was in Ga for about a month when my Chevy ate the tranny. I got about 16 driving to work which was back roads about 55mph. and it only got about 17.5 driving to Atlanta straight highway. I never really did any straight city so no real clue but i would have thought right in line with your number since i drive pretty hard in town.Mike
1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).
2009 Saturn Aura XE (wifes car)
2011 F-150 Crew 4X4
"Hold it to the floor till you see God.... Then Brake!!!!"
09-24-2010, 07:50 AM #3
- Join Date
- Apr 2010
- Piermont,NY, back in Northern NJ now, But may be in IL soon....
My Avg MPGs on the 08 Av is 14.3 now...Thats with the 8-4 motor and with K&N,Corsa and Superchips programer...I think my 02 Av got better..08 Z71 Avalanche Mods to date: K&N CAI,Hellwig Swaybars and End Links, Corsa Sport Exhaust, Superchips Programer,IPCW LOF & 3rd brake light and tails, AMI Gas door,Show Hooks and Door locks, Enkei Wheels, with Pirelli tires, StreetScene Bowties, Grant Steering wheel,Muth signal mirrors,SSBC Big Brake kit,Huskyliner Mug gards,Floor mats and Hood shield, McGard Lug nuts and locks, Bedrug, Cervini's Ram Air hood,35watt HID Fog lights, Sylvania bulbs all around ZXE's Highs and Lows, WhiteNight Back up lights,Sirius and HD Radio, SnugTop sitting on deck now Got a Softopper on now,Tempress Boat Hatches.... New Bilstein shocks are on... New Mods coming soon..... X
09-24-2010, 08:48 AM #4
Hmm, I still think something is up with my mpg. Maybe I'll see what it's at after an oil change and the cover back on. But I can't imagine it getting much better.
09-24-2010, 08:56 AM #5
Well your Avi is all stock isnt? I mean your not running huge offroad tires etc? because on my 06 i lost 2mpg (not kidding either i was ticked) when i switched to the Goodyear Wrangler Silent Armors (kevlar and HEAVY!) after i switched to Duellers i got 1.5Mpg back from the OEM and junk tires..
09-24-2010, 09:06 AM #6
I'd have to check to see if the tires on it are the right size. They seem to have a mildly aggressive tread on them.
Just looked and the tires are the right size. 265/70/17 Good year wrangler AT/S. I don't know if these are typically heavier than any other tire.
09-24-2010, 09:08 AM #7
Thats the right size.. And those AT/S arent that heavy i just picked up a set for my 2000 Z71 and they seemed lighter than the tires that were on it.. Hmmm mabey its time for a tune up a little early...
09-24-2010, 09:42 AM #8
09-27-2010, 12:12 PM #9
Just a little update:
Did an oil change Saturday. Since the oil change I've only driven today on the usual route (Drive my son to school and come back home), and noticed the mpg creep up a little to 11.6mpg from 11.4.
I didn't reset the mpg so it may be showing a slower increase due to previous miles driven/recorded. I'll reset it tomorrow and see what it does.
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