Modding for mileage - Pontiac G6 Forum
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post #1 of 21 (permalink) Old 01-20-2010, 09:15 PM Thread Starter
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Modding for mileage

Well I just bought a 2006 G6 GTP with 55k on it (km) and I'm only getting about 500km a tank (70% highway) which is right around 11.9 to 12.4L/100km.

I was hoping to squeeze a few hundred more km out of a tank and was wondering if there are any mods people have done that increase mileage? i.e. on my grand prix putting an intake on and doing some minor exhaust work allowed the engine to breathe a lot better and actually gave me better mileage.

Thanks!

Last edited by spyder83; 01-20-2010 at 09:20 PM.
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post #2 of 21 (permalink) Old 01-21-2010, 04:54 PM
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The same holds true, intake an exhaust. Though the exhaust is more expensive than what you could save in gas.

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K&N drop-in filter, Pennzoil Platinum 5W-30, 50% tint all around, other than that completely stock

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post #3 of 21 (permalink) Old 01-21-2010, 09:38 PM
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800k? No way!

Quote:
Originally Posted by spyder83 View Post
Well I just bought a 2006 G6 GTP with 55k on it (km) and I'm only getting about 500km a tank (70% highway) which is right around 11.9 to 12.4L/100km.

I was hoping to squeeze a few hundred more km out of a tank and was wondering if there are any mods people have done that increase mileage?
This is a common question for those who buy a Jeep (mine got stolen and was replaced by the G6). The common answer is to stick a brick underneath the gas pedal so that you don't stomp down on it so hard.

Seriously, the best I have been able to do with the 3500 VVT V6 is just around 8 l/100km, driving it pretty conservatively on the highway, though at sustained speeds around 130 k/hr. If you have the same engine and drive about as conservatively you might be able to get as much as 750k out of a tank, assuming you went from virtually overflowing at the start until the fuel pump starts to suck air.

The only mods I can think of aside from those to your driving behavior are as mentioned less restrictive intake and exhaust, and also find some taller and narrower tires. Wider tires = poorer fuel economy (but better traction).

One of the behaviours I learned while driving the Jeep was coasting to stops as much as possible, shutting off the engine if I thought I would be waiting more than 10 seconds at a stop (very common in my area), and accelerating as gently as practical.

~ MattInSoCal
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post #4 of 21 (permalink) Old 01-23-2010, 10:36 AM
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Quote:
Originally Posted by spyder83 View Post
Well I just bought a 2006 G6 GTP with 55k on it (km) and I'm only getting about 500km a tank (70% highway) which is right around 11.9 to 12.4L/100km.

I was hoping to squeeze a few hundred more km out of a tank and was wondering if there are any mods people have done that increase mileage? i.e. on my grand prix putting an intake on and doing some minor exhaust work allowed the engine to breathe a lot better and actually gave me better mileage.

Thanks!
You'll get good mileage with little weight in the car (a 300lb driver will get worse mileage than a 150lb driver!), take stuff out of the trunk that doesn't need to be there, make sure tires are at proper pressure. I find 34psi is the best compromise between mileage and comfort.

I get around 500km/tank with mixed city/highway driving, and still have around 1/4 tank left over. If I use the auto-stick and hold gears in higher rpm then mileage drops to as low as 350km a tank. In the winter I always fuel when it gets to the half way mark, to reduce any condensation buildup as I park my GT outside. Straight highway I managed 8.1L/100km at 115km/h. Keep in mind that the EPA doesn't account for final drive ratios. They'll test the car with the tallest legs to show the better mileage figures. This is why the EPA states "Your mileage may vary". A base V6 has a 2.89 final drive or around there, where as my GT has the 3.29 final drive, which increases engine speed by 200-300rpm at any given speed in top gear on the highway. Naturally, it eats more fuel as the auto-stick transmission is more complex and saps more power than the regular automatic.

Best thing you can do cost wise, is to get a good high flow (Amsoil EA) drop in air filter, run synthetic oils if you haven't done so already, and try to lighten vehicle weight. On a side note, I noticed a difference in mileage, more so with my Ford Taurus when I lost 72lbs. Just food for thought. The cost of an exhaust and air intake will take the near part of a decade to pay for itself, and it won't necessarily give you better mileage, they're advertised to give better 'performance' only. If you keep speed low, 110km/h or less on the highway you'll see a mileage improvement with just a premium drop in air filter.

'11 Ram SXT 4x4 quad cab - 5.7L V8; 128,200kms
'09 Malibu 2Lt 3.6L - 140,000kms purchased 1 March 2019

'06 Pontiac G6 GT - 3.5L V6; 162,000kms (rear ended 15 Feb 2019, and given totalled title by insurance)
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post #5 of 21 (permalink) Old 01-23-2010, 11:22 AM
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I get 30.9 miles (not sure about Km) per tank.....

wooo hoooooo!!!

MODS:
Crab Intakes CAB, MPD Ram Air hood, Custom exhaust,
WAMS High Performance Tune and a whole lot more....

My Progession
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post #6 of 21 (permalink) Old 01-23-2010, 11:27 AM
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I get 30.9 miles (not sure about Km) per tank.....

wooo hoooooo!!!
30.9 miles per tank? Driving it at full speed in first gear perhaps? You must mean per gallon!

'11 Ram SXT 4x4 quad cab - 5.7L V8; 128,200kms
'09 Malibu 2Lt 3.6L - 140,000kms purchased 1 March 2019

'06 Pontiac G6 GT - 3.5L V6; 162,000kms (rear ended 15 Feb 2019, and given totalled title by insurance)
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post #7 of 21 (permalink) Old 01-23-2010, 11:40 AM
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ya think?

MODS:
Crab Intakes CAB, MPD Ram Air hood, Custom exhaust,
WAMS High Performance Tune and a whole lot more....

My Progession
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post #8 of 21 (permalink) Old 01-23-2010, 12:03 PM
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ya think?
Someone has to around here.

'11 Ram SXT 4x4 quad cab - 5.7L V8; 128,200kms
'09 Malibu 2Lt 3.6L - 140,000kms purchased 1 March 2019

'06 Pontiac G6 GT - 3.5L V6; 162,000kms (rear ended 15 Feb 2019, and given totalled title by insurance)
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post #9 of 21 (permalink) Old 01-23-2010, 12:27 PM
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Has to? ...so you want to change things?

MODS:
Crab Intakes CAB, MPD Ram Air hood, Custom exhaust,
WAMS High Performance Tune and a whole lot more....

My Progession
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post #10 of 21 (permalink) Old 01-23-2010, 01:06 PM
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Has to? ...so you want to change things?
Only if the money's good.

'11 Ram SXT 4x4 quad cab - 5.7L V8; 128,200kms
'09 Malibu 2Lt 3.6L - 140,000kms purchased 1 March 2019

'06 Pontiac G6 GT - 3.5L V6; 162,000kms (rear ended 15 Feb 2019, and given totalled title by insurance)
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post #11 of 21 (permalink) Old 01-23-2010, 05:08 PM
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Before the gloves go one can I at least get a video camera and some popcorn first? LOL
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post #12 of 21 (permalink) Old 03-22-2010, 04:06 PM
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Probably not a completely wise idea, but I removed my intake resonator and got slightly better millage (according to my fuelly.com dashboard) and better throttle response. I also have a K&N drop in, but I got that the day after I bought the car.
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post #13 of 21 (permalink) Old 03-22-2010, 05:27 PM
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it should be okay...i took mine out while I had my drop in. it was fine and ran better
like you said.

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post #14 of 21 (permalink) Old 03-22-2010, 07:12 PM
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(In my opinion)

When moding for fuel economy I would suggest that the conditions before the mod and after the mod be as close as possible. If its 80 degrees and muggy for the first test then you change one little thing and make a run, say another day, at 65 degrees and low humidity then the chances are that the fuel mileage WILL go up due to the denser/colder air.
Just my two bits.



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post #15 of 21 (permalink) Old 03-22-2010, 10:19 PM
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I got bored and threw on those E3 spark plugs tonight, snappier throttle response, lets see if I get a boost in MPG like Horsepower TV said I would :-P
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