Install front spoiler.... better MPGs?


Sep 30, 2009
Norwalk SoCal
Ok, before you think I'm some kind of nut.... well, I keep pretty accurate fuel economy records.I use Fuelly primarily, but even prior I used to check my MPGs EVERY SINGLE TANK to track it.

Here is the Mustang Fuelly page for example....

So you see, I've got a few tanks of fuel as an example. Getting most of my tanks in the 19-21 mpg range was pretty common until a couple of weeks ago. I installed a Mach1 style front spoiler on the car.


No other changes were made at that time.

Now... I ran out the last of the 3/8 of that tank that was in there and it was normal. On the low side of normal, but not out of line for my averages.

However, on the first two full tanks of gas that I have run through, my mileage jumped to 21.9 and 22.0 mpg average. Easily.

I got 340, and 333 miles out of each of those tanks. I feel I probably had another 20 miles or so in the tank today even.

My driving style has not changed, my commute certainly has not changed, and as I said before, there were no other changes made to the car. I cannot positively contribute the change to the spoiler, but so far it's pretty compelling. However, I will keep track of it.

Anyone else running one and notice the same thing?
  • Sponsors(?)


Active Member
Sep 27, 2006
Vero Beach, FL
I think you're some kind of nut. :D

Any other variables to consider? Different weather? Same basic driving routine/routes/time of day?


Founding Member
May 16, 2002
Visit site
The less air going under the car the better. If you lower it some you might see another mpg gain. I'm guessing you do a lot of highway driving?

I just installed the Boss front valence and splitter on my car. It's not really a good test since my driving route is all over the place, but I did just get 23.6 mpg where my previous best was 23.3. I think the 23.3 was mostly driving easy and I got on it some with the 23.6 tank.


SN Certified Technician
Jul 19, 2007
Vernon BC
I guess anything is possible. But, where does the deflected air flow? Is the air directed up into the rad or is it just spilling the air to either side? What's happening here will make a difference.


My mission is to out curmudgeon you
15 Year Member
Jun 14, 2004
Acworth, GA
Husky. What's the difference in fuel economy between the cooler months and summer months. I was about to say winter and summer, but I remembered you don't drive your car in the winter at all.



No fap for you!
5 Year Member
Dec 18, 2010
Dayton, OH
Don't forget also that "winter" fuel and "summer" fuel are different mixtures, and your fuel mileage WILL be better on "summer" gas. ;)

That said, improved aerodynamics will help with mpg. :)


Feb 17, 2002
Greater Atlanta Area
Id expect to see an improvement and that's about what i average on the highway with my car and the same front lip installed.

Sent from my DROID RAZR using Tapatalk 2


Sep 30, 2009
Norwalk SoCal
I think you're some kind of nut. :D

Any other variables to consider? Different weather? Same basic driving routine/routes/time of day?
Weather has been pretty consistent out here lately. We are hitting a "gloom" time of the year. Higher than normal humidity (around 45-55% RH for us) and the mid 70s for temps. Overcast skies for the better part of the day too.

My commute is the same through the week. I really only drive the Mustang during the week too. 32 miles each way to work every weekday. 64 miles a day, around 325 miles a week. Fill up Friday after I make it back home, start running it back down Monday. Leaving work on Friday with the needle not even touching the red zone on the fuel gauge was throwing me off. Normally it's juuuust touching it, and it's enough fuel to get me home with ease. However, the last two weeks I've had slightly more.

Also, I thought summer gas was where your mileage took a dump? I thought that's when they dropped in more ethanol to reduce emissions.


Active Member
Sep 27, 2006
Vero Beach, FL
Summer vs. winter fuel blends will differ depending on where in the country you are.

As far as my mileage is concerned, I have no idea. When I installed the 3.73s I never fixed the speedo gear, so I can't figure mileage without doing some algebraic gymnastics that I don't really feel like doing.

My mileage ain't that great, but it still beats the snot out of what my V10 Excursion gets, so I still call my 95 my "green" car. :D
Thread starter Similar threads Forum Replies Date
M Anyone installed a Ford Mustang Colt Style Front Bumper 83 84 85 86 by Duraflex - 103539 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 6
fredfifty Suspension Front Coilover Install - Brake Line Too Close Fox 5.0 Mustang Tech 1
T Suspension Front spring install problem /question Fox 5.0 Mustang Tech 7
R Fox Front Springs Install Question 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 59
mpeach1976 Noise In Front After Installing Lowering Springs 2010 - 2014 Specific Tech 1
Y Engine Help! Installed Front Crank Shaft Seal Backwards 1994 - 1995 Specific Tech 3
Sean91LX Easy Front Control Arm Bushing Install?? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 4
J '69 Front Floor Support Install Classic Mustang Specific Tech 4
J '69 Front Frame Rail Installation Classic Mustang Specific Tech 27
mikec35 Labor Cost To Install Mustang Ii Front Suspension Classic Mustang Specific Tech 4
R Installing 66 Mustang front fenders Classic Mustang Specific Tech 5
J Front bumper and header panel install 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 1
1967project Front Coil Springs Install Help Classic Mustang Specific Tech 17
JymboSlice RTR front splitter installed pics 2005 - 2014 S-197 Mustang -General/Talk- 11
JarvisB Installed Pro Kit springs on my 88 and the front end still sits high? help Fox 5.0 Mustang Tech 6
xporter Installed CS/GT front bumper, pics 2005 - 2014 S-197 Mustang -General/Talk- 3
J Poor Brake Pressure after front disc install Classic Mustang Specific Tech 13
R power front window install for 1969 ford mustang convertible Classic Mustang Specific Tech 0
J How are you guys installing/compressing your front springs? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 32
N Installing new front seal silicone the seal? Fox 5.0 Mustang Tech 6
georgio440 Installed Terminator front bumper, hood won't close. 1996 - 2004 SN95 Mustang -General/Talk- 7
calpolymustang front crank seal: which side of timing cover is it installed from? Fox 5.0 Mustang Tech 5
Coleman My CCP Front Suspension Install Pics Classic Mustang Specific Tech 1
N Front spring install with no motor or trans Fox 5.0 Mustang Tech 1
S clunk after new shocks and front springs install Classic Mustang Specific Tech 2
R Hawk Front pads install ? SN95 4.6L Mustang Tech 8
2 Front bumper install... Difficult??? 1996 - 2004 SN95 Mustang -General/Talk- 8
B Installing front brakes on the rear. 2005 - 2009 Specific Tech 7
Team Ford GT to Cobra front & rear brake install w/ pics *T1 beware :) SN95 4.6L Mustang Tech 13
P Front Sway Bar End Link Bushings Look Bunched, Squished on Install SN95 4.6L Mustang Tech 2
8 Front Control Arm Bushing Installation Fox 5.0 Mustang Tech 2
sburkey1967 Front and Rear Window Installation Classic Mustang Specific Tech 17
MustangLX-5.0 FINALLY got front Eibach springs installed. Pic (Low Qual) Fox 5.0 Mustang Tech 5
M front brake install SN95 4.6L Mustang Tech 1
I installing OEM front springs help please... SN95 4.6L Mustang Tech 5
fox-gt 66 - front bumper guard install ? 1965 - 1973 Classic Mustangs -General/Talk- 1
harrison Best way to lift front of car for shifter installation 2005 - 2009 Specific Tech 3
EPIK Maximum Motorsports front coilover kit installed. WOW!!!! 1996 - 2004 SN95 Mustang -General/Talk- 43
ApexStang Anyone Install the CS/GT Front Bumper? 2005 - 2014 S-197 Mustang -General/Talk- 0
9 Front Coil Spring Install Question Fox 5.0 Mustang Tech 12
gruvee87vertgt Installation of Cervinis Stalker front? Besides for baking and painting..what else? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 9
Hauuse96gt 03/04 cobra front bumper install price 1996 - 2004 SN95 Mustang -General/Talk- 13
Snikt89GT How do you install front spring??? Fox 5.0 Mustang Tech 86
metroplex Has anyone installed the Ford (F6/1996) front flat splash guards? 2005 - 2014 S-197 Mustang -General/Talk- 6
B Roush Front Facia Number Installation Template Special Production 9
dastang2 installing front suspension want to slot caster plates. Fox 5.0 Mustang Tech 6
V FRONT CLEAR CORNERS~~~INSTALL??? 2005 - 2009 Specific Tech 13
tr7driver Install Front Plate 2005 - 2009 Specific Tech 13
D Steeda Tubular Front Swaybar and Prothane Endlinks Installed 1996 - 2004 SN95 Mustang -General/Talk- 2
F Front crankshaft seal installation Classic Mustang Specific Tech 3
Similar threads