97 miles to tank ... bolt on GT?

M

madonionrs

New Member

Jun 7, 2003

250

0

0

Buffalo NY

Apr 14, 2004

#1

• Apr 14, 2004

• #1

Anyone ever get 97 Miles to the tank on a bolt on 1989 Mustang.

3.73s on AOD.
Pullies
Timing
Exaust

Thats about it. It doesn't smell like its leaking gas. Runs pretty good too.

Anyone experience milage like this?

 

ECU5.0

Banned

Jan 10, 2004

1,803

1

0

raleigh, nc

Apr 14, 2004

#2

• Apr 14, 2004

• #2

that is absolutely horrible gas mileage. just to give you some advice...let someone else who drives a mustang listen to your car, i thought my car was running really well until i pulled up to my work and some of my buddies who all own stangs were standing there and were like holy ***** your car is missing like crazy. turns out my number 3 cylinder wasnt firing at all because of a bad plug wire.

 

D3l7a_3ch0

New Member

Mar 20, 2004

15

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0

stationed in vegas

Apr 14, 2004

#3

• Apr 14, 2004

• #3

i don't have any bolt ons but i just installed a remanufactured longblock (5.0)... new ignition, new front O2 sensors... i've gone through 3/4 of my tank and i'm not even at 110mi.

do i have to do some highway driving for the computer to "re-learn" the new engine? i heard something like that.

i have heavy wheels and tires, but even with those my old engine gave me around 250mi/tank... never below 225mi even when i stomped it everywhere...

i'm about to take it to a local tune shop to see what they say. i'd still like to know if anyone has experienced this before. thanks.

 

M

madonionrs

New Member

Jun 7, 2003

250

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0

Buffalo NY

Apr 14, 2004

#4

• Apr 14, 2004

• #4

D3l7a_3ch0 said:

i don't have any bolt ons but i just installed a remanufactured longblock (5.0)... new ignition, new front O2 sensors... i've gone through 3/4 of my tank and i'm not even at 110mi.

do i have to do some highway driving for the computer to "re-learn" the new engine? i heard something like that.

i have heavy wheels and tires, but even with those my old engine gave me around 250mi/tank... never below 225mi even when i stomped it everywhere...

i'm about to take it to a local tune shop to see what they say. i'd still like to know if anyone has experienced this before. thanks.

Click to expand...

Holy HiJacking BatMan....
JK, man these things can go from bad on gas... to

 

TwoToneTerror

New Member

May 1, 2003

311

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0

Portland OR area

Apr 14, 2004

#5

• Apr 14, 2004

• #5

How much are you putting in every time? (gallons) It seems you probably have other problems too but your fuel gauge could also be off some, i know mine says my tank is empty when i still have 5 gallons to go, so that could be one of the issues. It might be worth taking it to a dealer and let then do a checkup on it to see what's wrong so you know what you need to fix or replace, or just have them do it. That'd be what'd i do...

Good luck!
-Bart

 

D3l7a_3ch0

New Member

Mar 20, 2004

15

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stationed in vegas

Apr 14, 2004

#6

• Apr 14, 2004

• #6

that's similar to what i'm getting. w/ the old engine it was quick to drop to 1/2 tank (after 75 mi) and i'd miraculously get 150-175 mi w/ the second half of the gauge.

right now it's been at 1/4 tank for the last 25mi... just sorta stuck there. but i doubt it's gonna stay there for another 100 miles.

but thanks, i'll mention that to them. maybe they can check to see how much gas is actually still in the tank.

have you heard of the injectors being stuck open on these engines? i read something like that once but it didn't mention anything about what caused it and what the resulting gas mileage was like.

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

34

129

Apr 15, 2004

#7

• Apr 15, 2004

• #7

might want to check the wiring (have you actually computed the gas milage to rule gauge, etc out)? sorry if you said that and i missed it.

also make sure you dont have any leaks at the tank or along the fuel line run. gas loves to evaporate if given a chance.

BTW, i get 12 -15 MPG in town, for whatever that is worth.
good luck.

 

D3l7a_3ch0

New Member

Mar 20, 2004

15

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0

stationed in vegas

Apr 16, 2004

#8

• Apr 16, 2004

• #8

ah. today i let my gauge hit E. put in ten gallons and it's at 1/2. i know that's not right. tomorrow i'm gonna fill it up to see how many more gallons it takes. what's the tank capacity on a 95gt, anyway?

 

N

Na5.0HO

New Member

May 29, 2003

342

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Michigan

Apr 16, 2004

#9

• Apr 16, 2004

• #9

Sorry Madonionrs... cant offer any advice cause I'm in the same boat... I just got 110 miles on the last tank!! Car smells like it's running pretty rich, but that still seems a bit extreme. No leaks...
I thinking maybe missing a cylinder or 2 cause I recall my spark plugs looked like poop last time I had them off. Could they be causeing my problem??

 

65ShelbyClone

Founding Member

Sep 9, 2000

4,675

38

119

Antelope Valley, SoCal

Apr 16, 2004

#10

• Apr 16, 2004

• #10

I dont know if I'm the only one confused here or not, but I'll say it since I havent seen it yet. Fill it up all the way until the pump stops, reset the odometer, and drive until you get to 1/2 or 1/4 tank. Then fill it up until the pump stops again, preferably from the same station/pump, then see how many gallons it took and compare it to your odometer.'

Seriously, you cant get an accurate reading from any of the stock guages.

BTW, 21mpg average with mods in sig.

 

HyPer-50

Member

Jun 26, 2003

377

0

16

Woodstock, GA

Apr 16, 2004

#11

• Apr 16, 2004

• #11

I average around 150 miles to a tank, so about 10mpg... And thats me riding pretty hard on it. less than 100 miles for a 15 gallon tank with just gears and other minor bolt ons.... yup somethin's up

 

SLiM JiM 156

Founding Member

Mar 18, 2002

1,024

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36

Rohnert Park, CA

Apr 16, 2004

#12

• Apr 16, 2004

• #12

D3l7a_3ch0 said:

ah. today i let my gauge hit E. put in ten gallons and it's at 1/2. i know that's not right. tomorrow i'm gonna fill it up to see how many more gallons it takes. what's the tank capacity on a 95gt, anyway?

Click to expand...

15.5 Gallons, if your really running that ****ty of gas mileage, check your o2 sensors, they could be all fouled up

 

T

TheUser

Active Member

Jul 25, 2003

1,859

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36

Springfield, MO

Apr 16, 2004

#13

• Apr 16, 2004

• #13

65ShelbyClone said:

I dont know if I'm the only one confused here or not, but I'll say it since I havent seen it yet. Fill it up all the way until the pump stops, reset the odometer, and drive until you get to 1/2 or 1/4 tank. Then fill it up until the pump stops again, preferably from the same station/pump, then see how many gallons it took and compare it to your odometer.'

Seriously, you cant get an accurate reading from any of the stock guages.

BTW, 21mpg average with mods in sig.

Click to expand...

i've heard you get better gas mileage on the i first half-tank than the last...not sure why, but if that's true, then comparing at half of a tank would be inconclusive; i'd fill it up, reset trip odo. and run as far as you an on it and then fill it up, see how many gallons you put in to fill it back and up compare that to the milegage on the trip odo...

 

D3l7a_3ch0

New Member

Mar 20, 2004

15

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0

stationed in vegas

Apr 16, 2004

#14

• Apr 16, 2004

• #14

hey isn't this interesting, i had a smog test done today for nevada registration... i passed. so right now i'm thinking it's the beat up suspension and heavy wheels. (i'm in the process of restoring the suspension)

the rear O2 sensors could be changed, i'll give that a try.

oh yah... i don't have mufflers yet they passed me. i think i've found a great shop and i'm stickin' with em... having them install 3.73's tomorrow(with the installation kit)... 100 bux labor. it's about time, too. those parts have been sitting in the box for a year.

whatever gas mileage i'm getting now, it's about to get worse. haha

 

I

Idwitheld-1`

New Member

Nov 30, 2003

335

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Portland Oregon

Apr 16, 2004

#15

• Apr 16, 2004

• #15

My 1st GT I would get 260 miles on a tank (17mpg freeway) with 60K on the ticker (totally stock).

Today I figured 16.5 mpg on my current GT. about half city, half freeway.

 

65ShelbyClone

Founding Member

Sep 9, 2000

4,675

38

119

Antelope Valley, SoCal

Apr 17, 2004

#16

• Apr 17, 2004

• #16

TheUser said:

i've heard you get better gas mileage on the i first half-tank than the last...not sure why, but if that's true, then comparing at half of a tank would be inconclusive; i'd fill it up, reset trip odo. and run as far as you an on it and then fill it up, see how many gallons you put in to fill it back and up compare that to the milegage on the trip odo...

Click to expand...

Thats not even remotely true and I dont see how it could be. If anything your economy would improve the farther down the tank you get due to less weight. That is, IF there was a difference, which there isnt.