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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 5 of 6

#36 of 52 Re: 2007 pontiac g6 bad gas mileage [vms] by packer3

Jul 17, 2008 (5:07 pm)

Replying to: vms (Jun 28, 2008 8:07 pm)
There is no problem thats the way it is going to be all the time there is no fix, had a 05 Malibu V6 16mpg was tops in the city and 37mpg was tops for the highway returned it after 23,000 miles it was leased. I went throgh the same thing with the dealer they give you the we cant find anything, however in reality they know the answer, when you talk to other people "live" not blogs, you will find some of your answers.

#37 of 52 Don't trust the mileage computer by elkbow2003

Dec 30, 2008 (5:30 am)

Don't trust the mileage computer to be accurate. Check it by dividing the gallons used into the total miles traveled on the tank of gas. Then reset your mileage and check another tank. The best way to get an accurite reading is run 4-5 tanks of gas and check the mileage using all fuel used and all the miles driven. (IE 75 gallons used in 2025 miles = 27mpg)
 
I've seen the mileage computers be off 5 mpg or more.I have a 2004 Chevy truck that was off about 1.5 mpg consistently. It always got about 1.5 mpg less than the computer said it got.

#38 of 52 09 2.4 mileage by gonogo

Jul 31, 2009 (8:11 am)

Just made a 500 mile trip at 70 mph, some a/c, got 31.5 mpg, I can live with that.
It was gallons divided by miles.

#39 of 52 Re: 09 2.4 mileage [gonogo] by pbowler

Sep 16, 2009 (5:19 am)

Replying to: gonogo (Jul 31, 2009 8:11 am)
Mine is a 2009 4 cylinder with the 6-speed auto "Sport Package". I already have more than 15,000 miles on it. The mileage with this package is satisfactory. I consistently achieve more than 420 miles per tank and average a little over 30 mpg overall. My work commute is highway, seldom stop and go, making the mileage easier to achieve. I have occasionally achieved 32+ mpg for a tankful (doing the math), but it is usually a little lower. It does not often achieve the EPA rating, but then few cars do in the real world other than hybrids or diesels. The only indicator I watch is miles left per tank; The mpg indicator is only useful to monitor driving habits, not for accurate, achievable measurements.
 
For the total package considering size, roominess, comfort, performance, I am reasonably happy. We will see about long term. I am used to taking my cars to 200,000 miles but do not expect that of this car. I have owned mostly VW or Subaru over the years.

#40 of 52 Re: 2007 pontiac g6 bad gas mileage [mgarcia2411] by pennie3373

Feb 23, 2010 (1:39 pm)

Replying to: mgarcia2411 (Jan 12, 2008 10:36 am)
I have a 2008 Pontiac G6 4-cylinder sedan and I drive short distances. I drive approximately 4-5 miles per day with the longest distance without stopping being 6-10 blocks. I average 14-15 miles to the gallon. The sticker in the car says that I should be getting 22 so they say to figure 2 below that for a more accurate estimate. I am not getting anywhere near this. I average less than 200 miles per tank and it is absolutely ridiculous. I am so disappointed in myself for buying this vehicle. I am going to lose a heck of a lot of money off of it between licensing it and paying to fill it up constantly.

#41 of 52 Re: 2007 pontiac g6 bad gas mileage [pennie3373] by gonogo

Feb 24, 2010 (9:12 am)

Replying to: pennie3373 (Feb 23, 2010 1:39 pm)
Your drives are too short, get a plug in electric car and your would never need gas.

#42 of 52 Re: 2007 pontiac g6 bad gas mileage [mgarcia2411] by maddog0324

May 25, 2010 (6:34 am)

Replying to: mgarcia2411 (Jan 12, 2008 10:36 am)
I have a 2008 4cyl Sedan that I bought used with 19,000 miles in July '09. I now have 43,000 miles. I have been averaging 24.5 mpg per tank, with 80/20 highway/city commute, 10% of the highway miles are stop/go traffic. On the open highway, I always use the cruise control to maintain 8mph above the speed limit. My last road-trip was 735 miles and I averaged 28.1 mpg. My last 90% city driving tankful only averaged 19.2 mpg. I don't go by the on-board mileage average, I divide the miles driven by fuel used. I don't let the fuel gauge go below 1/4 full, because it gets pricey using 93 octane (91 octane is what the owners manual calls for and 91 octane is not available in my area). I am a firm believer that spark-knock will kill the engine. EPA fuel economy is estimated based on optimum conditions, not realistic situations. What percentage is your city/highway driving and what grade gasoline do you use?

#43 of 52 Re: 2007 pontiac g6 bad gas mileage [maddog0324] by gonogo

May 25, 2010 (7:38 am)

Replying to: maddog0324 (May 25, 2010 6:34 am)
My 09 2.4 takes 87 octane, right in the owners manual. You better read your manual again.

#44 of 52 Re: 2007 pontiac g6 bad gas mileage [gonogo] by maddog0324

May 25, 2010 (11:05 am)

Replying to: gonogo (May 25, 2010 7:38 am)
Your 09 is also compatible with E85 Flex-Fuel, correct? This was not available for the 2008 model year.
 
The 2008 owners manual states:
 
"If your vehicle has the 2.4L L4 engine (VIN Code B),
use premium unleaded gasoline with a posted octane
rating of 91 or higher. You can also use regular
unleaded gasoline rated at 87 octane or higher, but
your vehicle’s acceleration could be slightly reduced,
and you might notice a slight audible knocking
noise, commonly referred to as spark knock. If the
octane is less than 87, you might notice a heavy
knocking noise when you drive. If this occurs, use a
gasoline rated at 87 octane or higher as soon as
possible. Otherwise, you could damage the engine. If
you are using gasoline rated at 87 octane or higher and
you hear heavy knocking, the engine needs service".
 
A 4 cylinder engine would not benefit from reduced acceleration. I also don't want my ride sounding like some beater. Premium unleaded in my area is 93 octane. I will not use a fuel posted 6 octane points lower than recommended. Back in the day, you could get around spark knock by adjusting the timing and fuel mixture. Since cars these days are computer controlled and no user adjustments are available, I'll go with what is stated in my owners manual.

#45 of 52 Re: 2007 pontiac g6 bad gas mileage [maddog0324] by gonogo

May 26, 2010 (9:32 am)

Replying to: maddog0324 (May 25, 2010 11:05 am)
My engine is code B, 87 octane. Only 09 that will run E85 is the 3.5 VIN code K.
 
It also states the 3.6 VIN code 7 will run better on 89 octane for towing. Everything else in the 09 line up is 87 octane.
 
Something must have changed from 08 to09.

Messages Page 5 of 6

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