• Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-

Question on gas

  • Thread starter Thread starter rocknrod
  • Start date Start date Aug 28, 2007
R

rocknrod

New Member
Jun 14, 2007
13
0
0
va
Aug 28, 2007
#1
  • Aug 28, 2007
  • #1
I been reading alot of post, and seen where some of you guys/girls are making 380 to 425 hp and getting 20 miles to the gallon. I am getting only about 12 mpg my setup is 302 b303, gt40p heads, gt40 intake, 70mm tb, 19lb injecters, fms headers into h -pipe, underdrive pullys, cold air, ac delete, smog delete and 373 gear, is there something I've done wrong? or need to change!

Thanks for any info.
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,265
17,952
224
Massachusetts
Aug 28, 2007
#2
  • Aug 28, 2007
  • #2
Drive like a grandma.



Seriously.

Hell, i get 27MPG on the highway with my stock '03 GT if i drive like a grandma, but if i start rolling through the gears spirted a bit, it drops down to 12-15MPG.
 

5spd GT

"the 5.0 owns all"
Founding Member
Aug 7, 2002
9,516
6
99
Arkansas
Aug 28, 2007
#3
  • Aug 28, 2007
  • #3
Make sure your car is tuned - fresh plugs, air filter and oil clean, sensors clean.

20mpg is probably pure highway for those cars, but in town isn't going to be near as good

I have got 24mpg in my 340 (est. hp) car because I drove easily and at an okay rpm of 2,000-2,200...
 
M

MustangOwner

Banned
Dec 13, 2006
160
0
0
Aug 28, 2007
#4
  • Aug 28, 2007
  • #4
i got 12 on my bone stock engine when i had it But thats cause how i drove it! I'll never drive it like a grandma I'll sacrifice the extra 8 miles per gallon! I didn't buy all the hp to drive it like a honda right?
 

Shakerhood

20+ Year Stangneter
Oct 28, 2004
3,359
209
114
Ohio
Aug 29, 2007
#5
  • Aug 29, 2007
  • #5
My Stang usually gets about 22 MPG Overall Average, but its not 400 HP either.
 

91 HATCH

Banned
May 17, 2007
262
0
0
illinois
Aug 29, 2007
#6
  • Aug 29, 2007
  • #6
I only get about to busy givin it hell to care
 

ninety15.0

New Member
Mar 10, 2004
1,336
0
0
Aug 29, 2007
#7
  • Aug 29, 2007
  • #7
I get about 18mpg with mixed city/highway driving and 25 on the highway! All the time! I do drive like a litttle old lady though...and i dont care. there is no reason for me to drive like a fool on the streets, attract unwanted attention, and burn through excessive amounts of gas. It certainly doesnt get me anywhere any faster. Clean components, fuel filter, wires, plus, cap, rotor. Most of all its a light foot. I have a vac gauge and watch it like a hawk. I have 3.73's and cruise at 75-80 on the highway at 2500-2650 rpm....all the time.
 

SVT32VDOHC

waiting for the next hack atta
Founding Member
Nov 22, 2001
3,501
28
119
Motor City
Aug 29, 2007
#8
  • Aug 29, 2007
  • #8
I cannot drive like a grandma especially when I drive my cars about 1,000-1,800 miles per year. I get on them after every light or freeway entrance ramp!
 

stykthyn

I want to measure mine. It doesn't look that tall.
15 Year Member
Jul 6, 2006
5,232
2,652
223
gainesville
Aug 29, 2007
#9
  • Aug 29, 2007
  • #9
+1 on the entrance ramp!
 
B

Boss 351

Here sthhhhhhhheeeve take a picthh of my man flowe
Jul 13, 2003
2,433
23
48
Canada
Aug 29, 2007
#10
  • Aug 29, 2007
  • #10
I got 27 with the coupe but it was geared 2:73 and driving like a grandma, maybe had 200 something HP too...

My current one, I don't know... never checked, I have a 4 banger for MPG - the stang is for MPH not MPG
 
R

rocknrod

New Member
Jun 14, 2007
13
0
0
va
Aug 29, 2007
#11
  • Aug 29, 2007
  • #11
wow

ninety15.0 said:
I get about 18mpg with mixed city/highway driving and 25 on the highway! All the time! I do drive like a litttle old lady though...and i dont care. there is no reason for me to drive like a fool on the streets, attract unwanted attention, and burn through excessive amounts of gas. It certainly doesnt get me anywhere any faster. Clean components, fuel filter, wires, plus, cap, rotor. Most of all its a light foot. I have a vac gauge and watch it like a hawk. I have 3.73's and cruise at 75-80 on the highway at 2500-2650 rpm....all the time.
Click to expand...

75-80 I'm taching 3000
 

ninety15.0

New Member
Mar 10, 2004
1,336
0
0
Aug 29, 2007
#12
  • Aug 29, 2007
  • #12
No you're not. Unless you have changed from the stock 26" tire, there is no way you are tacking 3g's at 75-80. Are you running a stock tach? My RPM is verified from a 5" autometer and a tweecer. 3000rpm is 90mph with 3.73's.
 
R

rocknrod

New Member
Jun 14, 2007
13
0
0
va
Aug 29, 2007
#13
  • Aug 29, 2007
  • #13
ninety15.0 said:
No you're not. Unless you have changed from the stock 26" tire, there is no way you are tacking 3g's at 75-80. Are you running a stock tach? My RPM is verified from a 5" autometer and a tweecer. 3000rpm is 90mph with 3.73's.
Click to expand...

Im running 245/50/16 and my 5in tach runs about 200 more than my stock tach
 

millhouse

Founding Member
May 14, 2002
1,985
0
46
Simpsonville, SC
Aug 29, 2007
#14
  • Aug 29, 2007
  • #14
rocknrod said:
Im running 245/50/16 and my 5in tach runs about 200 more than my stock tach
Click to expand...

Just a heads up, @ 80mph you should be running ~ 2660rpm with those 3.73's in 5th.
 

fivespeedsteed

20+ Year Stangneter
Oct 17, 2003
748
22
69
Richmond, VA
Aug 29, 2007
#15
  • Aug 29, 2007
  • #15
oh god here it goes....
 

Disturbed90gt

New Member
Jul 25, 2007
0
0
0
portsmouth, va
Aug 29, 2007
#16
  • Aug 29, 2007
  • #16
i cant tell you MPG for mine cause................my gas gauge doesnt work....lol
 

Ike83

Member
Sep 27, 2006
0
0
17
St. Louis, Missouri
Aug 29, 2007
#17
  • Aug 29, 2007
  • #17
Ummm.......yeah. That definitely matters zero when it comes to figuring out gas mileage. Next time you fill up just count how many gallons you put in while noticing how many miles you've driven.

Do the math.
 

samickguy15

Member
Sep 1, 2005
404
0
16
Delavan, IL
Aug 29, 2007
#18
  • Aug 29, 2007
  • #18
Ike83 said:
Ummm.......yeah. That definitely matters zero when it comes to figuring out gas mileage. Next time you fill up just count how many gallons you put in while noticing how many miles you've driven.

Do the math.
Click to expand...

LOL...very true. My 2.3N/A Stang gets about 21/22 with mixed hard running and highway and 25-29 with all highway. It actually seems to get better mileage at 80 than at 65-70. Don't really understand that other than peak torque curve I guess.

I suspect when I get my 5.0 swap done in the other 4-banger it will be decent with a 2.73 gear and .79 OD from the 4-banger T-5.

Just figured it up. With the 2.73 gear and .79 OD it will be like having a .58 OD on 3.73's. Not sure if that will be good or bad...
 
You must log in or register to reply here.

Similar threads

Progress Thread Giving an abandoned 88 GT project a new chance at life
  • jaketractor
  • Jan 9, 2025
  • Fox 5.0 Mustang Tech
  • 2
Replies
27
Views
2K
Fox 5.0 Mustang Tech Jul 20, 2025
Noobz347
N
Engine 1994 Mustang GT AODE puzzling issues
  • noah5slow
  • Oct 22, 2022
  • 1994 - 1995 Specific Tech
Replies
6
Views
2K
1994 - 1995 Specific Tech Oct 29, 2022
noah5slow
N
A
1991 5.0 with HCI - started car, running for a few minutes, started pushing coolant into the overflow tank and then puking out from there. I'm lost
  • AmericanMuscle4.6GT
  • Oct 16, 2022
  • Fox 5.0 Mustang Tech
Replies
6
Views
4K
Fox 5.0 Mustang Tech Nov 30, 2022
CAMTWO1070
E
1900 rpm at first idle/first start 88GT
  • elamorwey
  • Mar 3, 2022
  • Digital Self-tuning Forum
Replies
7
Views
2K
Digital Self-tuning Forum Mar 3, 2022
elamorwey
E
H
'86 New Turbo Build First Start/Idle Trouble. Full Tune specs attached
  • Heffay
  • Jul 10, 2022
  • Digital Self-tuning Forum
Replies
8
Views
3K
Digital Self-tuning Forum Jul 12, 2022
Heffay
H
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?