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I have the exact same car as the original poster - a 2005 G6 GT - and I have consistently gotten 21 mpg in a mixture of city and highway driving. Could be better, but I suppose it could also be worse.
 

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I have a new 2008 G6 convertible (love the car!) with the 3.9 HO. I have 520 miles on it, and I'm getting 19 MPG in town - I'm ecstatic about 19 MPG because the sticker said 15 MPG in town.

While I don't really hot rod the car, I don't drive like a grandma either (I do drive conservative, though, most of the time).

When you folks post your MPG, please try to include engine size, so we can make better comparisons.

Thanks, and have a great 4th!!
 

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I got as high as 35.7 mpg on the highway today at about 65-70 mph, 3.5L V6 (18k miles) Sedan.

I filled up the tank, reset the mpg on the radio display and hit the highway without any stops. After about 25 miles I was still getting a steady 35.7. I'll be driving down to PA tomorrow (mixed city/highway and hills), I'll post what I get.
 

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WOW! 35.7 for a 3.5 by GUNIA is awesome. I drove about 25 straight highway miles after a fill up today, and got 25 MPG from my 3.9.

BTW, I have the 4 speed auto. I would assume that the 6 speed auto would do even better, but GM decided not to do that to keep the price of the convertible as something we common folks could afford.
 

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Ok came back from my little trip. Total miles 342.5. The radio display reads 30.1 mpg. I calculated 28.1 mpg. There is a little discrepancy, could be the method I use, but even a worst case average of 28 mpg is great.

The trip was about 70% highway (60-70 mph), 30% local (30-45 mph, lots of traffic lights, hills, no bumper to bumper traffic).

I was also using a fuel system cleaner during this trip, but I doubt that had an effect on the mpg.

I didn't check the tire pressure, but I usually have it at 33-34 psi. Engine oil and air filter was changed recently.
 

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WOW! 35.7 for a 3.5 by GUNIA is awesome. I drove about 25 straight highway miles after a fill up today, and got 25 MPG from my 3.9.
I still get 28 mpg with mostly highway driving in my Impala (3.8L V6). I did get an average as high as 32 mpg. The 3.9 obviously has more power, but might also have more aggressive gearing. Also if you have larger rims, that adds additional weight to rotate...not to mention the additional weight of the convertible.
 

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I have a 2005 G6 GT with the 3.5 liter V6 and I recently got 35 mpg on a highway roadtrip. That's the best mileage I've ever gotten in this car, it has 40k miles on it, and I was pretty happy with that. It was mostly flat high desert straightaways with some rolling hills and small mountains every once in a while.

In city driving I usually get 21 mpg on the dot. Which is not so great, but certainly could be worse.

For a v6, I'm pretty happy with it and any money I spent on a hybrid would not make a large enough difference to cover the initial cost of the new car. I had been thinking of upgrading to a Prius but I will probably drive this car into the ground and then buy a small electric or hybrid in 2012 when Toyota and Honda come out with their latest hybrid technologies.

There have been a number of electrical gremlins with the G6, and the dealer experience has not been positive. Which is why I will probably get a Honda next.
 

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There have been a number of electrical gremlins with the G6, and the dealer experience has not been positive. Which is why I will probably get a Honda next.
Had I not joined this forum I may have never heard these troubles you and others are having. I owned 2 Pontiacs before the G6 and have had great expereinces with them both. Now, with the G6 I am still in favor of Pontiacs cars. Maybe I'm just getting lucky. (?) Sure, there are some small issues that pop up but nothing a little TLC won't cure.
With that being said you need to know I also own a Mazda and it has its share of "little issues" too.
Good Luck!
 

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I have a 07 with a 4 cyl and I get right around 28-33 mpg. I drive 70+ miles a day with some city driving thrown in. I have 21,000 miles on the car. I backed off the gas from 70 mph on the highway to 60 and the gas mileage jumped from 23.5- 25 mpg to that 30 mpg. It takes an extra 5 mins. to get to work in the morning but its worth it for the extra 6-7 mpg. I was filling up about every 4 days. If I do just highway miles I can get 33 mpg. would have never believed it made that big a difference.
 

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I calculate the gas mileage myself because I find the computer to be a little off. I have an 06 GTP (3.9L V6) and the best i've got so far was 24MPG mainly hwy driving on a 240 mi trip. On average I only get about 19MPG with city and hwy combined.. not too impressed.
 

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I drive a 2007 G6 4cy Sedan with 37,000k

I do mostly local driving in upstate NY and average between 21-23 mpg. Took it on a few highway trips to Pittsburgh and Connecticut this summer and got around 29-30.
 

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30.2 mostly highway, a little stop and go on the daily commute this week. I drive 55-70 depending on the flow of traffic. On my road trips to PA I usually average about 32.7.

I have an '05 G6 GT with approximately 28,000 miles on it (bought it used a few months ago with only 19,000 on it).
 

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I drove to Galveston (before Ike hit) and got this with my LX9. Course my ram air and intake had allot to do with it I think....

 

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I have an '08 4-cyl, with about 8500 miles on it. I get about 21-21.5 mph with mostly city driving. On the highway, normally it's 28-32. I always thought the city mileage was a little low for a 4-cyl.
 

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I always thought the city mileage was a little low for a 4-cyl.
I think that is due to the weight of the car. Personally I feel a 6 cyl should be standard. My 6 with an LX9 gets better gas milage than the 2.4 so why
would you want to put a 4 in a G6. I dont understand it.
 
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