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Old 03-11-2015, 04:57 PM   #1
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What affects mpg?

I know spark plugs/wires and coil pack affect mpg. They're all still in working order changed like 50k ago, platinums etc

I have 4.10 gears. My parents are kinda buggin me about it since I lost 20-30miles to a tank. I refuse to go back to 3.27, I really like how lively the car is. Used to be I was at 280 miles when the light turned on, now its 240-260~. The area I live in is alot of gentle rural roads, and school is like 30 min away on the hwy lol

o2 sensors are the original ones and the car has 168k and looking at reviews on AM people are noting restored power, mpg from just replacing the oem ones so that i'm doing next. Is there anything else past this and my right foot that affects mpg? Been on top of tire pressure too.

"Joey" 2004 v6: SR CAI, MPT Tuned, 4.10 gears
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Old 03-11-2015, 05:23 PM   #2
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What affects mpg?

If you're that concerned about mpg you could always remove some weight from your car (back seats, spare tire/jack, etc.)

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Old 03-11-2015, 05:24 PM   #3
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I wish i could get those numbers. I've heard under inflated tires, bad alignment, you may have a heavy foot
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Old 03-12-2015, 09:36 AM   #4
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I get around 200 a tank, but I have a heavy foot and live in the city. That is with stock gears

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Old 03-12-2015, 09:57 AM   #5
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Ive found that there is a lot that takes effect in gas mileage. you are talking about "Joey" in your description right?
my 2002 gt that gets roughly 220-235 a tank in the city. back home in a smaller city i would get better. but these lights like to hold for so long. longest i ever really pull off is 320 to a tank, mostly highway, quarter tank city. this is with 3.27's.
one way to watch a lead foot is to use a device that will show you a number on throttle input. (usually percentage). I use my phone, a bluetooth obdII device, and an app called dash command. All you really need is something that shows livedata usually.
basically, the goal is to keep the throttle low when cruising. its very easy to be in 5th gear and push the gas slightly too hard and getting a lower fuel mileage. if you have something that can show you your instant mpg, its a good way to help you find the best shift points. you want to balance power and efficiency. simply putting it in 5th gear at 35mph and pushing the pedal farther will use more gas, and take longer to get to the desired speed. but pushing slightly too hard at 2krpm will sink your mpg.

hope this gives you something to work with. otherwise fuel filter, plugs and wires, fuel injector cleaning, 02 sensors getting old, tire pressure, alignment, carbon buildup, stuff like that all affects the gas mileage in some way.
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Old 03-22-2015, 11:15 AM   #6
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I had the same problem. But if your running an automatic you should look into a shift kit. I swapped my auto for the 95 5speed and I get about 440 with my supercharged 3.8. I also have. A high performance air flow sensor not for my motor which in turn leans out my fuel. I learned this from when my mass air flow sensor went and my fuel mileage increased (crazy?!)

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Old 03-24-2015, 03:13 PM   #7
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Running lean to get good gas mileage is a pretty dumb idea, if you really have a supercharged motor it won't last long like that.

To the topic, I still get 150 miles to 3/4 tank of gas or so out of my built V6 I drive like an *** in all the time. Use to be 200 miles at about that point when stock (I still get that when I do long drives pretty easily), a proper tune goes a long ways with good driving habits.

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Old 03-24-2015, 04:03 PM   #8
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How you drive makes the biggest difference. I don't have a V6 but with my 4.6 I've seen as high as 22 and as low as 11.

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Old 03-24-2015, 04:19 PM   #9
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^this. With my 5.0, I've seen as high as 30 (once) 26 on good highway drives, and 19 in the city, if I get on it, 21 highway, 9 city.

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