What To Look Into Regarding Excessive Fuel Consumption

Dan_T_Mustang · November 27th, 2011, 07:15 PM

So I'm trying to get my 1995 Mustang GT to be a bit better on gas cause it should be A LOT better.

Things I've done so far:

- Clean MAF
- Spark Plugs
- Wires
- Fuel Filter
- Cap And Rotor

Question is what else could be causing the car to spend too much gas? I'm thinking of looking into the 02 sensors next. Lastly I don't drive it hard at all, and I'm shifting at 2000rpm's.

furreal302 · November 27th, 2011, 07:46 PM

does the exhaust smell rich at all? check for air/vacuum leaks

Dan_T_Mustang · November 27th, 2011, 07:55 PM

Originally Posted by furreal302

does the exhaust smell rich at all? check for air/vacuum leaks

No it doesn't.

Dan_T_Mustang · November 27th, 2011, 08:21 PM

I'm really leaning towards the 02 sensors right now, anyone have any insight on how much of a difference these would do to your fuel economy?

johnGT · November 27th, 2011, 10:49 PM

Originally Posted by Dan_T_Mustang

I'm really leaning towards the 02 sensors right now, anyone have any insight on how much of a difference these would do to your fuel economy?

I was just about to suggest those. They can have a PROFOUND affect on your fuel economy.

ryanw · November 27th, 2011, 11:01 PM

do you still have your EGR ?

95Slobra · November 27th, 2011, 11:20 PM

mine sucks ALOT..and also smells up the garage..sucks

Mustang Boy · November 27th, 2011, 11:49 PM

First question that should be asked is what kind of gas mileage are you getting? And how are you measuring your gas mileage.

dcam503 · November 28th, 2011, 12:17 AM

I'm having the same issue, interested in what mpg your getting and if your driving in the city or highways? i drive 70 miles round trip daily and get around 20 mpg/ 7 miles to the hwy from home.

Bullitt95 · November 28th, 2011, 12:59 AM

Originally Posted by Dan_T_Mustang

I'm really leaning towards the 02 sensors right now, anyone have any insight on how much of a difference these would do to your fuel economy?

Depends on the condition of the existing O2 sensors. If they're ready for retirement, new sensors will make a big difference.

johnGT · November 28th, 2011, 03:30 PM

Originally Posted by dcam503

I'm having the same issue, interested in what mpg your getting and if your driving in the city or highways? i drive 70 miles round trip daily and get around 20 mpg/ 7 miles to the hwy from home.

20mpg sounds pretty accurate. What kind of mods are you running?

Dan_T_Mustang · November 29th, 2011, 01:48 AM

Originally Posted by Mustang Boy

First question that should be asked is what kind of gas mileage are you getting? And how are you measuring your gas mileage.

I'm getting only about 118 miles for a FULL tank of gas, 02 sensors are still the factory ones I believe, and most of my driving is a good mix of city and highway.

And yes I still have my EGR.

Mustang Boy · November 29th, 2011, 03:10 AM

Do you have a CEL on? How aggressively do you drive?

I ask the second because when I first got my 94 I drove it like a madman and only got 12mpg(90% city). Now that I had laid off and relaxed I was able to average 21mpg on the highway and that is with 3.73 gears.

johnGT · November 29th, 2011, 09:37 AM

Originally Posted by Dan_T_Mustang

I'm getting only about 118 miles for a FULL tank of gas, 02 sensors are still the factory ones I believe, and most of my driving is a good mix of city and highway.

My o2 sensors are factory as well

. Either I'm really fortunate or just arrogant (my gas mileage doesn't vary much though).
As soon as it starts getting bad though, I'm replacing the o2's ASAP.

Bullitt95 · November 29th, 2011, 10:25 AM

Originally Posted by Dan_T_Mustang

I'm getting only about 118 miles for a FULL tank of gas, 02 sensors are still the factory ones I believe, and most of my driving is a good mix of city and highway.

Then I suggest you replace your O2 sensors. Worst case scenario your mpg won't improve and you'll have two good O2 sensors as spares.

95project · November 29th, 2011, 05:54 PM

Originally Posted by Dan_T_Mustang

I'm getting only about 118 miles for a FULL tank of gas, 02 sensors are still the factory ones I believe, and most of my driving is a good mix of city and highway.

And yes I still have my EGR.

Holy crap...thats bad...Check your O2's for sure...

Dan_T_Mustang · November 29th, 2011, 09:43 PM

Originally Posted by Mustang Boy

Do you have a CEL on? How aggressively do you drive?

I ask the second because when I first got my 94 I drove it like a madman and only got 12mpg(90% city). Now that I had laid off and relaxed I was able to average 21mpg on the highway and that is with 3.73 gears.

I do but I got it scanned and it showed up as a coolant tempurature sensor code but I changed it to a new one and it still comes on.

And I don't drive agressively at all on my daily commutes since I daily drive my car.

Thanks for all the replies guys, I'll probably change out the 02 sensors asap.

I'll let you guys know what difference they make if any.

dcam503 · November 30th, 2011, 12:46 AM

actually i just realzed i was dking my math wrong. i put 6 gal in and get 110 miles making it about 18mpg.. I'm not driving it hard, got exhaust, cai, msd ignition. what's this I'm reading about removing the egr? and i use plus.. only fill it once a month bit pretty much always keep it above quarter if that matters

Bullitt95 · November 30th, 2011, 06:32 AM

Originally Posted by dcam503

actually i just realized i was dking my math wrong. i put 6 gal in and get 110 miles making it about 18mpg..

OK, so you're getting 18mpg instead of 20 which still isn't bad. That does diddly squat to help the OP with his problem.

dcam503 · November 30th, 2011, 12:19 PM

no shit, i was stating i was getting shitty mpg to and wanted to know what was doing it for him. someone asked what mods i had, just answering. don't get your panties all bunched up. and while i may be getting decent mpg, i should be getting better.

op, have you tried fuel system cleaner? it wont do anything big but i got about 2mpg out of it with my last stang. also, im pretty sure you have a leak in you line somewhere.. have you followed your fuel line back to your fuel filter?

November 27th, 2011, 07:15 PM	#1
Dan_T_Mustang Newbie 1995 Mustang GT Join Date: Apr 2011 Location: British Columbia, Canada Posts: 25 iTrader: 0 reviews	What To Look Into Regarding Excessive Fuel Consumption So I'm trying to get my 1995 Mustang GT to be a bit better on gas cause it should be A LOT better. Things I've done so far: - Clean MAF - Spark Plugs - Wires - Fuel Filter - Cap And Rotor Question is what else could be causing the car to spend too much gas? I'm thinking of looking into the 02 sensors next. Lastly I don't drive it hard at all, and I'm shifting at 2000rpm's. __________________ Hurst Billet/Plus SST Short Throw Shifter, 1999 SVT Cobra Wheels, BBK O/R H-Pipe, Flowmaster American Thunder Catback Exhaust System, 5% Window Tint On Back 3 Windows, Eibach Pro-Kit Lowering Springs, Eibach 1" Wheel Spacers, BBK Cold Air Intake.

November 27th, 2011, 07:46 PM	#2
furreal302 Regular 94 GT 13.95@100 Join Date: Jun 2011 Location: NY Posts: 435 iTrader: 2 reviews	does the exhaust smell rich at all? check for air/vacuum leaks __________________ 94 Opal Frost GT ~230k T5 swap, other mods

November 27th, 2011, 08:21 PM	#4
Dan_T_Mustang Newbie 1995 Mustang GT Join Date: Apr 2011 Location: British Columbia, Canada Posts: 25 iTrader: 0 reviews	I'm really leaning towards the 02 sensors right now, anyone have any insight on how much of a difference these would do to your fuel economy? __________________ Hurst Billet/Plus SST Short Throw Shifter, 1999 SVT Cobra Wheels, BBK O/R H-Pipe, Flowmaster American Thunder Catback Exhaust System, 5% Window Tint On Back 3 Windows, Eibach Pro-Kit Lowering Springs, Eibach 1" Wheel Spacers, BBK Cold Air Intake.

November 27th, 2011, 11:01 PM	#6
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,063 iTrader: 0 reviews	do you still have your EGR ? __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

November 27th, 2011, 11:20 PM	#7
95Slobra Regular 1995 Mustang Gt Join Date: Sep 2011 Location: raleigh Posts: 218 iTrader: 0 reviews	mine sucks ALOT..and also smells up the garage..sucks __________________ *95' GT, Trickflow setup, Aluminum heads with 1:6 roller rockers, e303 cam, BBK shorties into Magnaflow exhaust, BBK cold air intake with 75maf, Highperformance waterpump w/ electric fans*

November 27th, 2011, 11:49 PM	#8
Mustang Boy Hardcore Enthusiast 1994 Mustang GT 14.582@92.58MPH Join Date: Sep 2005 Location: tampa florida Posts: 1,729 iTrader: 1 reviews	First question that should be asked is what kind of gas mileage are you getting? And how are you measuring your gas mileage. __________________ 315's Crew Black and White Crew Crew Member #2

November 28th, 2011, 12:17 AM	#9
dcam503 Newbie SN95GT Join Date: Nov 2011 Location: PDX Posts: 16 iTrader: 0 reviews	I'm having the same issue, interested in what mpg your getting and if your driving in the city or highways? i drive 70 miles round trip daily and get around 20 mpg/ 7 miles to the hwy from home.

November 29th, 2011, 03:10 AM	#13
Mustang Boy Hardcore Enthusiast 1994 Mustang GT 14.582@92.58MPH Join Date: Sep 2005 Location: tampa florida Posts: 1,729 iTrader: 1 reviews	Do you have a CEL on? How aggressively do you drive? I ask the second because when I first got my 94 I drove it like a madman and only got 12mpg(90% city). Now that I had laid off and relaxed I was able to average 21mpg on the highway and that is with 3.73 gears. __________________ 315's Crew Black and White Crew Crew Member #2

November 30th, 2011, 12:46 AM	#18
dcam503 Newbie SN95GT Join Date: Nov 2011 Location: PDX Posts: 16 iTrader: 0 reviews	actually i just realzed i was dking my math wrong. i put 6 gal in and get 110 miles making it about 18mpg.. I'm not driving it hard, got exhaust, cai, msd ignition. what's this I'm reading about removing the egr? and i use plus.. only fill it once a month bit pretty much always keep it above quarter if that matters

November 30th, 2011, 12:19 PM	#20
dcam503 Newbie SN95GT Join Date: Nov 2011 Location: PDX Posts: 16 iTrader: 0 reviews	no shit, i was stating i was getting shitty mpg to and wanted to know what was doing it for him. someone asked what mods i had, just answering. don't get your panties all bunched up. and while i may be getting decent mpg, i should be getting better. op, have you tried fuel system cleaner? it wont do anything big but i got about 2mpg out of it with my last stang. also, im pretty sure you have a leak in you line somewhere.. have you followed your fuel line back to your fuel filter?

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