Poor Gas Mileage - 2006 Mustang GT
11-01-2006, 01:23 AM
#1
1st Gear Member
Thread Starter
Join Date: Jul 2006
Posts: 142
Poor Gas Mileage - 2006 Mustang GT
I have a 2006 Mustang GT 5-speed. Fully stock, I got 17-18 MPG city / 21-22 MPG hwy. A few months ago, I had MAC mufflers installed. My MPG plummeted. Now I have been experiencing 12-15 MPG city / 19 MPG hwy. Everyone says it must be my driving habits, due to the new sound I must be heavier on the pedal. I have NOT changed my driving style. To prove the point, I tried driving agressively on one tank vs driving mildly on another tank. No difference in MPG! Still 12-15 city/ 19 hwy. I brought the car to the dealership and they told me that the "Break-in period" on the engine is 10,000 miles. They stated that since I have 9,500 miles, I could expect a fluctuation in miles and that the the advertised MPG of 17 city/25 hwy is a range that could be affected by weather, gas quality, etc... They further said that unless the "check-engine light" is on, they would not find anything. Then, a tuner suggested that I try disconnecting my battery overnight to let the computer reset itself. I am a little skeptical, but am considering it. Has anyone ever experienced this? How did you remedy the situation? Would disconnecting the battery rectify this odd situation? What else could the problem be?
11-01-2006, 09:53 AM
#3
5th Gear Member
Join Date: Mar 2006
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Posts: 2,544
RE: Poor Gas Mileage - 2006 Mustang GT
Hmm...that mileage does seem low.
Try the computer trick. It's easy and it can't hurt anything.
These cars have an ECU feature that "learns" driving styles and adjusts the drive-by-wire system to suit. Many people report improved throttle response and power after doing the battery disconnect trick....
Try the computer trick. It's easy and it can't hurt anything.
These cars have an ECU feature that "learns" driving styles and adjusts the drive-by-wire system to suit. Many people report improved throttle response and power after doing the battery disconnect trick....
11-01-2006, 10:33 PM
#4
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Join Date: Jan 2006
Location: Orange County, California
Posts: 746
RE: Poor Gas Mileage - 2006 Mustang GT
ORIGINAL: CrazyAl
Hmm...that mileage does seem low.
Try the computer trick. It's easy and it can't hurt anything.
These cars have an ECU feature that "learns" driving styles and adjusts the drive-by-wire system to suit. Many people report improved throttle response and power after doing the battery disconnect trick....
Hmm...that mileage does seem low.
Try the computer trick. It's easy and it can't hurt anything.
These cars have an ECU feature that "learns" driving styles and adjusts the drive-by-wire system to suit. Many people report improved throttle response and power after doing the battery disconnect trick....
11-01-2006, 10:53 PM
#5
2nd Gear Member
Join Date: Aug 2006
Location:
Posts: 305
RE: Poor Gas Mileage - 2006 Mustang GT
ORIGINAL: jmart69x
I have a 2006 Mustang GT 5-speed. Fully stock, I got 17-18 MPG city / 21-22 MPG hwy. A few months ago, I had MAC mufflers installed. My MPG plummeted. Now I have been experiencing 12-15 MPG city / 19 MPG hwy. Everyone says it must be my driving habits, due to the new sound I must be heavier on the pedal. I have NOT changed my driving style. To prove the point, I tried driving agressively on one tank vs driving mildly on another tank. No difference in MPG! Still 12-15 city/ 19 hwy. I brought the car to the dealership and they told me that the "Break-in period" on the engine is 10,000 miles. They stated that since I have 9,500 miles, I could expect a fluctuation in miles and that the the advertised MPG of 17 city/25 hwy is a range that could be affected by weather, gas quality, etc... They further said that unless the "check-engine light" is on, they would not find anything. Then, a tuner suggested that I try disconnecting my battery overnight to let the computer reset itself. I am a little skeptical, but am considering it. Has anyone ever experienced this? How did you remedy the situation? Would disconnecting the battery rectify this odd situation? What else could the problem be?
I have a 2006 Mustang GT 5-speed. Fully stock, I got 17-18 MPG city / 21-22 MPG hwy. A few months ago, I had MAC mufflers installed. My MPG plummeted. Now I have been experiencing 12-15 MPG city / 19 MPG hwy. Everyone says it must be my driving habits, due to the new sound I must be heavier on the pedal. I have NOT changed my driving style. To prove the point, I tried driving agressively on one tank vs driving mildly on another tank. No difference in MPG! Still 12-15 city/ 19 hwy. I brought the car to the dealership and they told me that the "Break-in period" on the engine is 10,000 miles. They stated that since I have 9,500 miles, I could expect a fluctuation in miles and that the the advertised MPG of 17 city/25 hwy is a range that could be affected by weather, gas quality, etc... They further said that unless the "check-engine light" is on, they would not find anything. Then, a tuner suggested that I try disconnecting my battery overnight to let the computer reset itself. I am a little skeptical, but am considering it. Has anyone ever experienced this? How did you remedy the situation? Would disconnecting the battery rectify this odd situation? What else could the problem be?
11-01-2006, 11:26 PM
#6
1st Gear Member
Thread Starter
Join Date: Jul 2006
Posts: 142
RE: Poor Gas Mileage - 2006 Mustang GT
I have been measuring my MPG by resetting the trip info meter each time I gas the car up. Have not noticed any fuel leaks. Car starts up no problem. Dealership supposedly did a diagnostic and confirmed that the car averages 14 MPG (No ****), but couldn't offer any helpful assistance- total waste of time dealing with the dealership and their attitude. I will try disconnecting the battery. I'll keep you all posted on my progress.
05-18-2008, 12:03 PM
#8
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Join Date: Apr 2008
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Posts: 74
RE: Poor Gas Mileage - 2006 Mustang GT
with my 06 gt stock except flow masters i was getting around 14 city and 24 hwy. after all the mods including gears i get around 12 city and 21 hwy. i am quite heavy footed also. your in town mpg at 12-15 seems normal. your hwy at 19 mpg seems low.
05-18-2008, 12:19 PM
#9
5th Gear Member
Join Date: Dec 2006
Location: Redding, CA
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RE: Poor Gas Mileage - 2006 Mustang GT
ORIGINAL: cwhite7
How excatly do you do the disconnet the battery trick?
How excatly do you do the disconnet the battery trick?
loosen the conection and pull it off
put it back on in the morning or a few days later
05-18-2008, 12:25 PM
#10
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Join Date: Dec 2006
Location: Redding, CA
Posts: 4,552
RE: Poor Gas Mileage - 2006 Mustang GT
In order to measure the proper MPG on the highway, you must make a fairly long freeway run. With a full tank of gas, not topped off, which means you don't fill it to the brim just before it overflows, drive 100-200 milesnon-stop on the freeway and refill it using the same method. Using the same pump and station would be great but not always convienant. That's how you get the best estimate of your fuel consumption.
Compare against your cars computer and you will see if there is a difference.
I know when I fill mine up there is always a slight difference in how much fuel the computer says I used and how much I get at the pump.
Compare against your cars computer and you will see if there is a difference.
I know when I fill mine up there is always a slight difference in how much fuel the computer says I used and how much I get at the pump.
