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Old 09-06-2013, 08:11 AM   #1
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Gas Mileage

I have a 2003 V6. Only mods are exhaust. Divorced duals, flowmaster 40's and pacesetter shorty headers. Other than that, its bone stock. I'm averaging about 10-11 miles per gallon. Had a horrible misfire, changed plugs and everything ran smooth. But still, gas is swallowed like its almost non existent. Any advice?
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Old 09-06-2013, 08:56 AM   #2
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Quote:
Originally Posted by JimmyMosqueda View Post
I have a 2003 V6. Only mods are exhaust. Divorced duals, flowmaster 40's and pacesetter shorty headers. Other than that, its bone stock. I'm averaging about 10-11 miles per gallon. Had a horrible misfire, changed plugs and everything ran smooth. But still, gas is swallowed like its almost non existent. Any advice?
That's horrible. Fuel filter or pump maybe? Also can you post a video for your exhaust?
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Old 09-06-2013, 11:57 AM   #3
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Will do whenever time permits!
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Old 09-06-2013, 12:01 PM   #4
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Last time you did a tune up?
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Old 09-06-2013, 12:06 PM   #5
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Wow I average better with my gt in the city
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Old 09-06-2013, 12:10 PM   #6
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Haven't done a Complete tune up since I got it in February. Motor just hit 90k
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Old 09-06-2013, 12:12 PM   #7
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Quote:
Originally Posted by JimmyMosqueda View Post
I have a 2003 V6. Only mods are exhaust. Divorced duals, flowmaster 40's and pacesetter shorty headers. Other than that, its bone stock. I'm averaging about 10-11 miles per gallon. Had a horrible misfire, changed plugs and everything ran smooth. But still, gas is swallowed like its almost non existent. Any advice?
Are you calculating it correctly
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Old 09-06-2013, 12:15 PM   #8
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^+1 lol
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Old 09-06-2013, 12:16 PM   #9
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Change the headers?
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Old 09-06-2013, 12:17 PM   #10
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Change the headers?
I had the same shortys on my 3.8 and never seen a drop like that..
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Old 09-06-2013, 12:20 PM   #11
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Are you calculating it correctly
Lol I'm pretty positive I am. Chugs three gallons on my 30 mile route to and from school every day.
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Old 09-06-2013, 12:21 PM   #12
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Lol I'm pretty positive I am. Chugs three gallons on my 30 mile route to and from school every day.
How do you know it's exactly 3 gallons? What is your formula?
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Old 09-06-2013, 12:26 PM   #13
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Total tank size is 15 gallons, correct? It uses a quarter of a tank on a daily basis. 15 divided by 4 is equal to 3.75. Not exact numbers but I'm sure its close.
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Old 09-06-2013, 01:01 PM   #14
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Total tank size is 15 gallons, correct? It uses a quarter of a tank on a daily basis. 15 divided by 4 is equal to 3.75. Not exact numbers but I'm sure its close.
The gas gauge is junk. In 90% of vehicles before 05.. Fill you car FULL drive x amount of miles fill it FULL again. Divide x miles by exact gallons put in the second time.. = MPG those gauges bassicly just say of you have gass or not..
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Old 09-06-2013, 01:11 PM   #15
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Yeah I still average 20 or better in mine, you have problems if that's what yours is actually getting lol
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Old 09-06-2013, 01:20 PM   #16
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The gas gauge is junk. In 90% of vehicles before 05.. Fill you car FULL drive x amount of miles fill it FULL again. Divide x miles by exact gallons put in the second time.. = MPG those gauges bassicly just say of you have gass or not..
Okay. I'll try this method. Thanks!
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Old 09-06-2013, 02:12 PM   #17
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Okay. I'll try this method. Thanks!
I thought we had a 14 gallon tank?
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Old 09-06-2013, 02:26 PM   #18
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Then that'll put it up to about 12 or 13 mpg lol
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Old 09-06-2013, 02:31 PM   #19
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The tank is 15.7, but as said before the gas gauge is useless to go by for accurate mileage
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Old 09-06-2013, 02:41 PM   #20
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The tank is 15.7, but as said before the gas gauge is useless to go by for accurate mileage
In that case I get under 20 as well. I thought I had a 14 gallon tank and was getting 21. I get a good bit less then
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Old 09-06-2013, 02:48 PM   #21
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In that case I get under 20 as well. I thought I had a 14 gallon tank and was getting 21. I get a good bit less then
Use the correct formula or you will never know what you get.

---------- Post added at 02:48 PM ---------- Previous post was at 02:47 PM ----------

I'm my 01 v6 I could go 80 miles before the tack left the F mark but I sure wasn't getting 80 mpg
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Old 09-06-2013, 02:51 PM   #22
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Use the correct formula or you will never know what you get.

---------- Post added at 02:48 PM ---------- Previous post was at 02:47 PM ----------

I'm my 01 v6 I could go 80 miles before the tack left the F mark but I sure wasn't getting 80 mpg
I do the right formula just with the wrong size tank. Lol. And my hand does that too. It'll stay on full for close to 70-80 and then it goes fast until around 1/4 of a tank then its slow again haha
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Old 09-06-2013, 03:10 PM   #23
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Make sure your doing the calculations correctly. You may have leaking fuel injectors which could cause bad mileage.
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Old 09-06-2013, 03:19 PM   #24
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Make sure your doing the calculations correctly. You may have leaking fuel injectors which could cause bad mileage.
Just figured it up. With the right tank size I'm getting 21 still
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Old 09-06-2013, 03:43 PM   #25
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Just figured it up. With the right tank size I'm getting 21 still
Tank size has nothing to do with mileage..
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Old 09-06-2013, 03:46 PM   #26
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+1. Only way that can make a difference is the weight but its really not a big difference anyway so it doesn't matter, still get the same mpg as you would with a smaller or bigger tank, just more or less you have to put in
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Old 09-06-2013, 03:47 PM   #27
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+1. Only way that can make a difference is the weight but its really not a big difference anyway so it doesn't matter, still get the same mpg as you would with a smaller or bigger tank, just more or less you have to put in
Yeah I wasn't thinking lol. The ratio would be the same
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Old 09-06-2013, 05:16 PM   #28
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I just got 13mpg. 191 miles and took 13.67 gallons to fill up.
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Old 09-06-2013, 05:45 PM   #29
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I just got 13mpg. 191 miles and took 13.67 gallons to fill up.
Lol. Maybe its a good thing I don't have a GT
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Old 09-06-2013, 08:01 PM   #30
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Every time you go to the pump, record your odometer and how many gallons you fill up, do the math and you will be able to keep a record of your mpg.... DO NOT TRUST THE GUAGE. I know that my car will start dropping right away and then will sit on empty for a while, my truck would sit at full forever and then squat to empty within a few days. Get an app on your phone that calculates it and only calculate it when you fill up, do not just think you used 1/4 tank and divide that by how many miles you drove, that will get you super bad results.
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Old 09-06-2013, 08:02 PM   #31
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Something like this... I got Sixpac hooked on this app
The numbers on the right is the distance i traveled, it automatically calculates the distance i traveled between fill ups when i put in my odometer reading when i fill up, then i put in how many gallons i filled up and it calculates. (don't top off, let it click then be done... or you will get inaccurate readings).

This was with my 01 Bullit, all were city miles except for the 17mpg one, that one i filled up then did about 80 miles highway and then filled up again.
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Old 09-06-2013, 08:24 PM   #32
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I do the right formula just with the wrong size tank. Lol. And my hand does that too. It'll stay on full for close to 70-80 and then it goes fast until around 1/4 of a tank then its slow again haha
No ware in any formula was there a tank size...
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Old 09-06-2013, 08:25 PM   #33
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My gass milage..
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Old 09-06-2013, 08:26 PM   #34
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No ware in any formula was there a tank size...
I know haha. That was before I sat down and thought about it. I just replied without really thinking haha. I just knew I had the tank size wrong in my head
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Old 09-06-2013, 10:21 PM   #35
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I know haha. That was before I sat down and thought about it. I just replied without really thinking haha. I just knew I had the tank size wrong in my head
15.7 gallons
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