Bad Gas Mileage!! Help

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Bad Gas Mileage!! Help

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Chevrolet Forum >> Chevy Trucks, Vans & SUV's >> Silverado >> Bad Gas Mileage!! Help

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Bad Gas Mileage!! Help - 1/9/2008 8:00:35 PM

kynknwl

Posts: 6
Joined: 1/9/2008
Status: offline

OK, I have about 5,000 miles on my new 2007 NBS Crew cab Z-71 5.3 w/ active fuel. I have 305/50/20 tires, and my gas mileage sucks! I am seeing around 14 on a good day! I had the same exact wheels & tires on my 05 crew cab Z-71 and it did way better! The gas mileage was the main reason I bought this new truck and I am very disappointed! People have said it's the wheels and tires but that is hard to believe for me, does anyone have any suggestions? Thanks in advance!

_____________________________

2007 NBS LTZ Z-71 Crew Cab 5.3

Post #: 1

RE: Bad Gas Mileage!! Help - 1/9/2008 9:59:56 PM

Soah

Posts: 8
Joined: 1/9/2008
Status: offline

I would say in no means am I qualified to know how to fix your problem but
I do know there are some things that will cause Excessive Fuel Consumption. They are

Dirty air filter.
Dirty injectors.
Incorrect Ingition timming.
Incorrect Idle Speed.
Fuel Leekage. (Most likly on your return line.)

(in reply to kynknwl)

Post #: 2

RE: Bad Gas Mileage!! Help - 1/14/2008 7:40:59 PM

jlm6740

Posts: 36
Joined: 11/11/2007
Status: offline

I have the same mileage on my 07 2wd LT2 with 275/55/r20 and have gotten 13 in town and 17-18 hwy. I haven't been too impressed and hope that maybe it might improve a little.

I've been driving with the instant mpg on the odometer and its driving me mad trying to get anything better no matter how much I baby it.

I tend to think that this tire & wheel combination have too much mass and sap mpg.

(in reply to Soah)

Post #: 3

RE: Bad Gas Mileage!! Help - 1/14/2008 9:31:12 PM

engine2

Posts: 1707
Joined: 12/24/2006
Status: offline

quote:

ORIGINAL: kynknwl
I am seeing around 14 on a good day!

That seems about right for city driving. I dont think you going to get much better with a 6000 lb vehicle.

(in reply to kynknwl)

Post #: 4

RE: Bad Gas Mileage!! Help - 1/15/2008 12:49:31 PM

kynknwl

Posts: 6
Joined: 1/9/2008
Status: offline

Well, I traded my wheels and tires for the factory 18's. We'll see if that makes a difference. BTW- the 14 was all highway, which is not what the truck is advertised to get.

(in reply to engine2)

Post #: 5

RE: Bad Gas Mileage!! Help - 1/15/2008 7:30:55 PM

IAfarmer

Posts: 42
Joined: 5/9/2007
Status: offline

You'd better take it in. I get about 17 on the highway with mine. Coworker gets 19 on the highway.

(in reply to kynknwl)

Post #: 6

RE: Bad Gas Mileage!! Help - 1/16/2008 7:29:06 AM

kynknwl

Posts: 6
Joined: 1/9/2008
Status: offline

Ya, it's going in today for an oil change to the dealership. I will have them check it out. I will let ya know if anything comes of it, thanks for the replies.

_____________________________

2007 NBS LTZ Z-71 Crew Cab 5.3

(in reply to IAfarmer)

Post #: 7

RE: Bad Gas Mileage!! Help - 1/17/2008 10:25:57 AM

FlapJack

Posts: 13
Joined: 11/20/2007
Status: offline

80% CITY 20% Highway - 14.6

Added tonneau and now 15.8

All highway, the best is 20.2

Towing 5500 lbs travel trailer 10.8.

(in reply to kynknwl)

Post #: 8

RE: Bad Gas Mileage!! Help - 1/17/2008 7:58:35 PM

fireant510

Posts: 10
Joined: 12/13/2007
Status: offline

Dude, it it your wheels and tires. I have an 07 Tahoe with the same engine. I tried to put 275x65x18 on mine and it dropped the gas big time. The 4/8 cylinder mode stuck in 4 banger mode all the time. So I had to put the same size that came on it.............and u know what, its still not like the stock ones. I don't know what it is but it sucks. I fell for u ................... I'm still pissed

quote:

ORIGINAL: kynknwl

OK, I have about 5,000 miles on my new 2007 NBS Crew cab Z-71 5.3 w/ active fuel. I have 305/50/20 tires, and my gas mileage sucks! I am seeing around 14 on a good day! I had the same exact wheels & tires on my 05 crew cab Z-71 and it did way better! The gas mileage was the main reason I bought this new truck and I am very disappointed! People have said it's the wheels and tires but that is hard to believe for me, does anyone have any suggestions? Thanks in advance!

(in reply to kynknwl)

Post #: 9

RE: Bad Gas Mileage!! Help - 1/18/2008 6:17:28 AM

neto1978

Posts: 23
Joined: 7/24/2007
Status: offline

Mine is doing 10 mpg on ethanol...very easy on the pedal!

(in reply to kynknwl)

Post #: 10