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Pontiac G6: Real World MPG

52 messages,  Last post on Jul 23, 2012 at 10:43 AM

You are in the Pontiac G6 Forum.

What is this discussion about? Pontiac G6, Fuel Efficiency (MPG), Coupe, Convertible, Sedan

Messages Page 4 of 6

#23 of 52 NEED HELP ASAP by thefunkybat

Dec 20, 2007 (2:15 pm)

I am looking at getting a new car, and really want to get a stick shift. I had been looking at getting a G6 for the longest time, and was excited to see you could get a 2007 in a standard. However, when I looked at the MPG at fueleconomy.gov, I was appalled to read that the only G6 you can get in a manual, the 3.9L 6-speed, gets 16 MPG city and 25 MPG highway. Does anyone own this car, and actually get this low gas mileage? Or is the website HEAVILY over-compensating?

#24 of 52 Gas Mileage reply by gstraub1

Dec 27, 2007 (12:52 pm)

Mine is a 2005 sedan V-6 auto. The dash has an electronic mileage counter. This car regularly gets 35 to 37 MPG on the PA Turnpike. However, in constant stop and go traffic, it's tough to get it over 20. 17 to 18 is the norm. Again, I am referring to constant stop light, stop sign traffic, no boulevard curising mixed in.

#25 of 52 2007 pontiac g6 bad gas mileage by mgarcia2411

Jan 12, 2008 (10:36 am)

I have a 4cyl and I average 250 miles to a full tank and am getting really frustrated i traded in my gmc envoy for this to save $$$ on gas and so far I am so dissapointed. It has about 5,000 miles and have had one oil change. Dealership kept telling me wait until you hit 3,000 miles then you will see a difference and I havent. The highest my computer has ever shown is 22.7 mpg and that was when i went on a long trip out of town and it didnt get up to that point until I was almost at my destination. I just dont get it, does anyone know what the probelem maybe? I have called GM and no help and the dealership says there is nothing they can do I do not speed i dont slam on the breaks. Any ideas? I cannot imagine getting the gas mileage some of you are getting in the 32's.

#26 of 52 Re: 2007 pontiac g6 bad gas mileage [mgarcia2411] by ajay5

Jan 18, 2008 (11:52 am)

Replying to: mgarcia2411 (Jan 12, 2008 10:36 am)
Wow, that mileage is terrible! Wish I had an answer for you.

#27 of 52 Re: 2007 pontiac g6 bad gas mileage [mgarcia2411] by jimtx

Feb 08, 2008 (2:44 pm)

Replying to: mgarcia2411 (Jan 12, 2008 10:36 am)
Does the car seem to be running properly. If it does, you should be getting at least 30 mpg with this car on the highway. In my experience, when someone is getting crappy gas mileage, and the car is running fine, you have to consider that it may be the driver. There are two types of driving that will kill your gas mileage:
 
The first type is the lead-foot who drives at high speeds, tailgates, and is always having to hit the brakes to keep from rear-ending the slowpokes. Even if you are not a tailgater, driving at 80mph will get much much worse mileage than someone who drives a modest 60mph.
 
The second type of driver who gets poor mileage is one who I have particular enmity towards--that is the people who drive an automatic with two feet, one on the gas and one on the brake. This type will swear that they are not riding the brake, but in fact they are and it will kill your gas mileage.
 
A good way to tell if you are either of the above driver types is to ask the following question: How many miles do I get off of a set of brakes? If the answer is anything less than 50,000 (and it should be more), you are either riding the brake or having to brake too often and it will kill your gas mileage.
 
If you can honestly say you are not one of these drivers, have the dealer check the car because something must be wrong.
 
Just my two cents. Hope it helps.

#28 of 52 Re: 2007 pontiac g6 bad gas mileage [jimtx] by mgarcia2411

Feb 08, 2008 (4:15 pm)

Replying to: jimtx (Feb 08, 2008 2:44 pm)
Hi and thanks for info, Im definately neither one of those drivers, I know all the tips that are supposed to help conserve gas mileage and Im very concious of my driving. Im always thinking about the gas mileage, I hate to even pass ppl on the highway b/c i believe it uses more gas. I have taken in and they say all they can do is hook it up to the diagnoistic machine and if it says nothing is wrong then they cant do anything. I have recently been monitoring the mileage when I drive and this is what I have concluded. When I drive on the highway for a long distance, the computer reading for the mpg goes up a point every 8 or 9 minutes. Thats even I am just staedy driving no stopping. It normally reads around 20.5 so if i take a trip thats usually where i am then about 8 or 9 minutes later it would go up to 20.6 then 20.7 and so on. Can you imagine how long it would take me to get to 30?!! I would have to drive to California and I live in Texas. The highest it has ever gotten is 22.9. But as soon as I get back in to town it declines much faster than it goes up. I have no clue how to get them to fix it!!

#29 of 52 Re: 2007 pontiac g6 bad gas mileage [mgarcia2411] by boh

Mar 16, 2008 (3:56 pm)

Replying to: mgarcia2411 (Feb 08, 2008 4:15 pm)
I may have an answer to your mileage dilemma. Axle Ratio! I am looking for someone with more info and data to see if it is the right answer. I am looking to help my daughter buy her first car. (She has been driving one I gave her for the past 4+ years) She wants one of the new G6's. So I began doing some research, and I started test driving the vehicles. I first drove the 3.5 V-6. Then this morning, I drove one of the 4 cyl's. I am looking for the most economical vehicle, but do not want to buy her a vehicle that will not perform over the next 5 years. Gas mileage is important, considering that she is going to be financially challenged, and is starting out a new family of her own. I was making a deal on one of the base models with the 4 cyl, and I noticed the axle ratio for that particular vehicle is 3.91. That set me back a bit. That is the standard axle ratio for that model. That is why the car ran as it did; with quite a bit of power and quickness, when I test drove it. I came home to do more research on axle ratio, without the car salesman following me around. The spec sheet on the G6's shows that they offer 4 different axle ratio's, depending on model and preferred package that is on the vehicle you are looking at. The ratio's available are 3.91, 3.29, 3.05 and 2.77. Not all ratio's are available on all of the vehicles, as far as I can tell. Does anyone know if you can get the 4 cyl. with a lower axle ratio than the 3.91 or not. It seems to me, that any of the other three ratio's would for sure increase the fuel mileage. Any info from someone that knows more about this would be appreciated! Thanks!

#31 of 52 Re: 2007 pontiac g6 bad gas mileage [mgarcia2411] by bud35

Jun 12, 2008 (5:55 am)

Replying to: mgarcia2411 (Feb 08, 2008 4:15 pm)
My 2008 4 cylinder G6 with 3000 miles behaves the same way your car does. The mileage is TERRIBLE. That's why I'm searching the net. Sorry to hear about the dealer experience, I'm bringing mine it tomorrow to have them look for an answer to the mileage issue. I've never had a car that averaged under 25 mpg. I'm getting below 21. ARG. Please post again if you find any answers and I'll do the same.

#32 of 52 G6... get the V-6 by wjtinatl

Jun 20, 2008 (5:57 pm)

I don't own a G6, but travel extensively and get them (and Saturn Aura's) as rentals quite often. My experience is the 3500 V6 will get an average of 25-27 mpg in mixed highway/city driving. Same with the Aura and Impala that share this engine. 4 cylinder G6 and Aura only get 20-21 at best. The earlier post regarding axle ratio is right on, the V6 is relaxed at 2000 RPM at 75 mph, the 4 cyl. runs at 3000 RPM. It's pretty obvious to me that GM created the 4 cylinder G6 and Aura to compete at a lower price point, not to offer a more economical car. However, 4 cylinder or 6, all these mid-size GM products have brake rotors that warp within 12,000 miles.

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