What gas mileage are you getting?

What's your average speed? Mine has been around 34mph

I am at 78K in my GT and avg speed 35 and 24 MPG (and I drive like a girl LOL )

i've been recently getting about 18 in strictly city driving (45mph max about 75% 30-35mph) sooooooooooo yeah. had a leak in my exhaust resonator just replaced with a glasspack we'll see if that brings it back up any not sure if the leak would have any affect on mpg

CruisinG6 said:

What's your average speed? Mine has been around 34mph

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About 35 mph, granted I didn't check that when I filled up.

G6-Jade-GT said:

I am at 78K in my GT and avg speed 35 and 24 MPG (and I drive like a girl LOL )

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I'm a girl and for sure don't drive like one.

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1 more mph and 5 more mpg. Proof that putting a smaller engine doesn't always yield better MPG

Unless I'm just thrashing my car more than I should be. haha

The size of the vehicle has alot to do with it aswell. Take a look at the mileage on any full size truck, the NA V6 version always has worse mileage than the NA V8 versions. Small engines have to work harder in bigger vehicles. As well, gearing and tire tread have a big impact.

CruisinG6 said:

1 more mph and 5 more mpg. Proof that putting a smaller engine doesn't always yield better MPG

Unless I'm just thrashing my car more than I should be. haha

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well we are taking a long trip so I'll be sure to post everything when we reach the gas station. I reset everything every fill up (mpg, trip mileage, and average speed) maybe that's where the difference is? Even though I'm not sure it would matter.


And I completely agree with dmanj.

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Dmanj said:

The size of the vehicle has alot to do with it aswell. Take a look at the mileage on any full size truck, the NA V6 version always has worse mileage than the NA V8 versions. Small engines have to work harder in bigger vehicles. As well, gearing and tire tread have a big impact.

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Exactly! I think the G6 shouldn't have been offered with a 4cyl. But any 6cyl yes. It definitely needs more power (esp torque) to make proper use of the trans and to have enough power to get around comfortably, and therefore be efficient. Plus I have grippier tires which I'm sure brought it all down a bit. Hopefully once I build the motor a bit I'll see more MPG's. but it all depends on the way I tune I suppose. That's the trade-off I guess. Lots of power and fun, Or mpg. haha

jts08g6 said:

well we are taking a long trip so I'll be sure to post everything when we reach the gas station. I reset everything every fill up (mpg, trip mileage, and average speed) maybe that's where the difference is? Even though I'm not sure it would matter.

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I do the same, Every time I buy gas I always get a full tank, and I always clear every field in the INFO display. And I also divide my miles by how many gallons I buy. The math always works out differently than what my stereo says for Average MPG. And it's ALWAYS either +/- No consistency. But they're always close. Usually anywhere from 0.2-2.0 +/- mpg

2007 4-cyl G6 with 60K miles. Just drove from Atlanta to Ocala, FL and got 32.9 MPG using the "old fashioned" arithmetic: divide miles driven by gallons registered on the gas pump. I'm lovin' this little car.

I have a GT 3500 and have never been higher than 27.5 with average speed of 45. I think the GT V6 does worse than the base V6, but the extra driving fun is worth it. I might try to shoot for economy and drive like a grandma this week to see what I can get it up to.

Mines a gt. I just pretty much take it easy on accelerating


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Thanks Rob. There is hope for mine! I have already been bad with this tank playing with the manual shift. It will have to wait a few days till I can try to get the most out of a gallon.

Manual shift = fun = to the gas station


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2007 GTP with the 3.6L VVT around 85K miles

I get about 25 highway. Average is between 21 and 23 depending on how aggressive my driving is.

i have the 3.5 in my 2009. i average about 27.5 mpg

my best avg on a tank is 28.2mpg

my 2.4 with this nicer weather is averaging about 26-28mpg now with mixed driving, averaging still about 34-35 mph and not really driving like a grandma haha

06 G6 GT, 3.5 V6, 127k, stock everything, 4 doors, 33 PSI all around cold, 87 octane. SWIM drove over 800 miles this weekend. 30 mpg 70 mph average. I hit some traffic, did some city driving, mostly on the highway doing 70 to 100 mph. The best I ever got was cruising 200 miles from a place with a higher elevation at 65 mph getting 33 mpg.

My 06 GT does very well. It cruises decently and can pull itself up hills on the highway without worry of downshifting from overdrive. I can get 29-31mpg with it depending on speed. Southern Ontario roads don't have many rolling hills to use in the sake of fuel economy. No matter which vehicle I use the throttle is almost always on, even if I use cruise control.

Strictly city driving I'm lucky to see 18mpg as I use the auto stick and keep rpm in the 2500-4000rpm range.