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Drive your Mustang and save gas.

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What is your best option for saving money at the pump?  It doesn't seem like gas is going down any time soon, so what do those of us that are crazy about their Mustangs do to combat the ever-rising price of gas?

Here's what I'm doing: 

I'm sure many of us are in the same boat.  Some of you drive your Mustangs every day.  Some of you are like me.  I own several vehicles, many of which are fox body Mustangs, none of which have less than 8 cylinders.  My daily driver is a truck, specifically a 2007 Silverado.  The Silverado gets about 17 mpg, on average, which is really good for a big, 4-door truck, but when gas is basically double what it was 2 years ago, it's as if I'm driving a motorhome back and fourth to work, 20 or so miles each way.

I needed a solution for my $100+ per week gas bill.

Here were my options:

  1. Drive less - I'm doing this, but I can't help the fact that I drive a mandatory 40-50 miles to work and back alone, each day, 5 days a week.
  2. Buy a cheap beater that gets good mileage - well, unfortunately, cheap beaters that are reliable are getting scarce, and not so cheap, and certainly not cool or fun to drive.  I've scoured for 4-banger fox bodies and they are bringing good money now, some are as much as 5.0 cars!  May sound vein, but I want a driver that is exciting.  My career and hobby both are based off of my love for cars, and I get enjoyment out of having a nice ride.  Don't get me wrong, I've driven some junk in my time, but I'd prefer not to.
  3. Trade - Well, I like and need my truck, and my wife's Suburban is unfortunately not worth what it was a year ago because of the price of gas.  I'm not about to take a major butt-whooping on either one of these rides just to save gas money.  I don't believe that losing tons of money on a car makes sense, no matter how much gas you save.
  4. Car pool - this is a good option, but our staff seems to be pretty spread out, and we all like our independance.

This brings me to my fifth option.....

Start driving the old 5.0 again - It's certainly not an economy car, but the mileage is better than the truck, it's still a blast to drive, it's pretty much a classic now, and I don't have to go buy another car.  I think I can improve the mileage, too.

Yep, the old red 92 coupe was the option.  So I had to address a few things that could help improve the mileage.  About 18 mpg on average is what I've always seen from this car, so the mileage was already better than the truck.  Mind you, this is driving the car with no regard for fuel mileage.  The car is a 5-speed with a Cobra intake, E303 cam, GT40P heads, and MAC longtubes.  The gears were 3.73's, and the timing was set at about 14 degrees initial.

The great thing about performance mods is that many improve the efficiency of the combination, therefore increasing the fuel mileage at the same time.  My intake, heads, cam and exhaust did not seem to me to be hurting the mileage, so I chose address the things that were obivous and easily improved.

The gears were 3.73's.  Since I had plenty of gears in my arsenal of parts, I went ahead and made the change back to the stock 3.08's.  In-town mileage never did really suffer with the 3.73's, but I do a lot of my driving on the highway, so the 3.08's should be an improvement. 

My extra timing wasn't hurting mileage, but I had to run super unleaded.  The timing is now back to 10 degrees initial, so the car runs fine on 87 octane.

My driving had to improve.  Since my Mustang wasn't my daily driver, it used to be for special occasions, or when I just wanted to rip on it.  I had to re-train my self to keep the rpm's low, and slow down a little.  We'll see how it improves.

I've got about a tank down since the gear change, and it appears that the car is going to help me save some money on gas.  My average is up to 20.  As time goes on, I may make some other tweeks that could improve mileage even more, such as an electric fan.  In the meantime, I'm enjoying being back in my fox, and saving gas at the same time.

Here's my list of tips for improving the mileage of your Mustang:

  1. Gears - if you do a lot of highway driving, 3.73's, 4.10's, or 4.30's may not be for you
  2. Timing - if you have a programmer, back off to the 87 octain tune.  Distributor guys - back the timing down to the stock 10 degrees btdc.
  3. Slow down - take your time and keep the rpm's down.
  4. Air pressure - check your tires.  Less air means more rolling resistance.
  5. Underdrive pullies - they cut parasitic loss, increasing horsepower as well as efficiency
  6. Electric fan - if you have a fox body, an electric fan will also decrease parasitic power losses
  7. Alignment - keep your front end aligned.  Badly mis-alingned front ends will result in excessive tire wear and more rolling resistance.

 

  

Published Jun 24 2008, 02:05 PM by scott s
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Comments

 

nate said:

Good tips, thanks Scott!

June 24, 2008 4:07 PM
 

Atomic said:

Scott, I am now riding the bus to and from work everyday for $6. Round trip is 52 miles.  Gas consumption on my 2003 4.0L Ranger is 22 mpg.  I am at 5314 ft. above sea level here in Albuquerque and I use 87/regular.  What can I do to improve my mileage?  "Chip"?  larger "Cold Air Intake"?  "Headers" and "Cat Backs"?  "Royal Purple"?  All?

Atomic

June 24, 2008 9:56 PM
 

scott s said:

All good choices.

Cold air intakes, headers, and exhaust, in theory, can show marginal gains in mileage due to increased efficiency.  If mileage is your only concern, though, the improvement in mpg's might not justify the cost of a full exhaust system and a cold air kit.  If you are looking for performance gains, as well as the potential for better mileage, then go for it.

Also, trucks (especially with smaller engines such as yours) are very sensitive to tire size and gearing.  A 2-3" diameter increase in tire size can have huge adverse effects on small engines due to the rolling resistance, weight, and effect on gearing.  Stay with stock gearing and tire diameter to optimize mileage.

June 25, 2008 9:17 AM
 

chris said:

My 91 5.0 TBird gets BETTER milage then my 05 6-banger Explorer! The 5.0 has underdrive pullys(dont get stuck in a trafic jam), Cold Air Intake, Headers, Custom Exhaust and 3:55's in the rear.

June 25, 2008 11:14 AM
 

Tom said:

I just did a road trip from Tucson to Grand Junction Co and back running mostly on secondary roads with speed limits up to 65 MPH.  My '03 notch back 5.0/5sp (with a/c) did pretty well on mileage.  My best average was 28 + mpg and I did this on a couple of tanks.  I've done just about everything that was mentioned at the start of this blog. That is better mileage than my Dodge with the Cummins in it by a long ways and #2 diesel is up around $5.00 a gallon.  Love my fox body mustang.

Tom

June 25, 2008 2:38 PM
 

SEAN said:

The foxes are good fuel economy cars (for v8s) the best I have done is 28.75 usually running 60-65 mph (no a/c) mods: ud pulleys, ram air, semi syn oil, hyperformace tune up, x-pipe,flow delta 40s, 308 gears, syn in trans (royal purple)

June 25, 2008 3:22 PM
 

SCOTTY2THAG said:

While on our lunch break yesterday we were discussing this same matter.  It seems like we have been seeing more and more weekend cars "i.e Corvettes, Cobra's, Camaro SS', WS6 T/A's" being transformed to the daily commuter instead of weekend pleasure car.  It really makes sense because the cars normally get better mileage than the average daily driver.  Until gas prices change for the better I suspect we will see more and more trucks and SUV's being parked so they can drive the sports car and save money.

June 26, 2008 8:56 AM
 

Willy-C said:

I bought a 1993 LX with the 5.0 and 5 speed three weeks ago.It's my daily driver. My commute is about 30 miles, round trip. The first tank of fuel calculated out to 25.6 MPG. I was pleasantly surprised.  The second tank has scored 24.6 and that included about three hours of 75 MPH running. The car has a low restriction air filter, long tube headers, underdrive pulleys and runs stock gears. That's an big improvement over a '79 Cobra 5.0 I had long ago. It got about 18MPG on a similar commute with stock gears, full length headers and a Holley 0-1850. I'm really pleased with the mileage and it's not such a bad hit to the wallet compared to the 28 - 32 MPG Neon I just retired.

June 30, 2008 8:12 PM
 

stang72 said:

my intake is pretty good with the gas mileage stuff, i'd recommend a ford racing intake and a superchip to anybody that is lookin for better gas mileage on ur mustangs

July 19, 2008 1:26 AM
 

abears said:

I just bought a 2000 Mustang v6 base model.  I've been researching CAI's and underdrive pulleys, but can't seem to find any pulleys for the base model.  Can I use those intended for the GT?  

August 4, 2008 12:12 PM
 

scott s said:

here's a link for the pullies you need.  

www.latemodelrestoration.com/iwwida.pvx

August 4, 2008 12:29 PM
 

sean said:

I have a 91 5.0 that is modded to say the least...now it may be unheard of but im getting about 27mpg on the hwy that was going from killeen to san antonio. Only hitting the throttle hard a couple times...(you know how that goes) But, I definately seem to get a lot better mpg after I put the Vortech on running 10 psi with 42 lb injectors 3.73's, GT40 heads and a more aggressive cam and of course a good tune.

But, for me Im not to worried about mpg since my next step is more modifications...for example the 347 going into it soon with a TKO600 still running the 10psi. and many more part thanks to you and your staff...

November 30, 2009 5:46 AM