Worst gas mileage possible with a stock motor

7upstang91

10 Year Member

May 30, 2008

936

124

74

Florida

Mar 25, 2009

#21

• Mar 25, 2009

• #21

mavmavv said:

Ive never gotten above 180 for a tank ever. Consider yourself lucky to be getting that.

Click to expand...

Same here! I get to 160 then the fuel pump whines and loss of all full throttle power. But I still have 3-4 gallons in the tank when I fill up which I dont understand. Maybe when I replace it, it will quit whining and i'll improve my miles per tank.

 

7upstang91

10 Year Member

May 30, 2008

936

124

74

Florida

Mar 25, 2009

#22

• Mar 25, 2009

• #22

87MustangGT5.0 said:

Thinking of that, my temp guage never goes up above the second line from the bottom at most?

Click to expand...

Mine does that two when I'm driving. But I've heard that these can way off. But mine does go up, only cause I now have a leak.

 

1987stangman

Member

Jul 12, 2006

684

24

19

Mar 25, 2009

#23

• Mar 25, 2009

• #23

87MustangGT5.0 said:

I always use premium shell gas and its always 25 bucks to fill up so like 12 gallons each time

Click to expand...

With your mods, why use premium gas? That could be your problem. Anytime I used ever mid grade my performance suffered but in your case there if obviously a underlying issue somewhere...My 87' was pretty bad on gas (13 MPG) before the rebuild, now I get around 18. It was a DD car.

 

old_blue

15 Year Member

Nov 3, 2003

1,783

282

124

Mar 26, 2009

#24

• Mar 26, 2009

• #24

287 tonite with 21 mpg. pretty stock though.

 

f8tlfiveo

My wife likes my spool and blow-off valve.

Aug 8, 2007

1,585

102

64

Lancaster, PA

Mar 26, 2009

#25

• Mar 26, 2009

• #25

i have 3.55 gears and a stock motor mostly city driving and get about 18mpg in the summer and about 15.5mpg in the winter, i think they put stuff in the gas to help keep it from freezing. every year its the same way, drops in the winter and comes back up in the summer. right now i am still getting 15-16mpg

 

87MustangGT5.0

Member

Apr 16, 2003

153

0

17

Maryland

Mar 26, 2009

#26

• Mar 26, 2009

• #26

1987stangman said:

With your mods, why use premium gas? That could be your problem. Anytime I used ever mid grade my performance suffered but in your case there if obviously a underlying issue somewhere...My 87' was pretty bad on gas (13 MPG) before the rebuild, now I get around 18. It was a DD car.

Click to expand...

I thought it would be pinging from the timing without it?

 

NotoriousGT350

Founding Member

Apr 3, 2001

891

0

17

Lubbock, TX

Mar 26, 2009

#27

• Mar 26, 2009

• #27

My car has about 214K miles with the motor stock with the exception of a K&N replacement filter. It has an off-road h-pipe, flowmasters dumped, and 3.73s with timing still at 10* using 87 octane.

Best Hwy 24 mpg
City, I usually average about 16 mpg. I have gotten 18 mpg twice in the 6 years I have owned the car.

 

8

88mustang92

Member

Mar 1, 2008

105

0

16

Mar 27, 2009

#28

• Mar 27, 2009

• #28

i got one for u, i will fill up all the way, drive for a little while until i get to about 1/4 tank left and will fill up. I get 11 mpg, with some beating.....ouch, no egr, no cats...