Fuel economy and tune - Ford Mustang Forum
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post #1 of 27 (permalink) Old 06-07-2013 Thread Starter
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Fuel economy and tune

Hey All,

I have a 2007 gt/cs vert with K&N CAI, hurst shifter and bassani axle back. I also have a Bama tuner and am currently running their 91 "race" tune. In a couple weeks I am going to take the car on a road trip (~3000) miles. Would putting the stock 87 octane tune in the car yield more fuel economy? If I do that, do I also use 87 octane? I am going from higher elevation ~5k' to sea level so I am sure just with air density changes I won't miss the power.

Just curious cause a 1-2mpg increase yields some $$ after 3k miles.

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post #2 of 27 (permalink) Old 06-07-2013
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well look at it this way. either way if it increases the overall mpg or not, you still should switch if your looking to save money. you'll save .20 cents a gallon going from 91 to 87 so look at it that way, and if you get an extra 1-2mpg thats just a bonus


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post #3 of 27 (permalink) Old 06-07-2013
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I don't suppose it would make your mileage any WORSE, but I can't say for sure whether or not it will be better. My mileage seems to have ticked up slightly with CAI and tune if I'm just cruising on the highway. My problem is that I can't help but lay into it on the streets which drops my mileage way down...:nogrinner

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post #4 of 27 (permalink) Old 06-07-2013
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I have used all flavors of the Bama tunes and the mileage seems to be about the same, within my measurement error. (inconsistencies in driving make it very difficult to compare exactly)

If anything, the 93 Race tune gets perhaps the BEST mileage . . . I think this is because it is very agressive with the timing and it is squeezing all the energy it can out of that 93 octane gas ; also it probably runs a hair leaner, again in an effort to get the best performance.

But the cost savings for the lower octane fuel would probably outweigh the mileage savings for the 93 octane tune and gas.

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post #5 of 27 (permalink) Old 06-07-2013
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Well

J.Bert points out some great facts. I would add as you come down the mountain and the temp rises and the humidity as well. The 87 will be sluggish requiring a little more fuel. I have noticed the Brenspeed 93 Tune is great. I live in a River Valley so average altitude is 301.4 and Humidity average over 28%. I'm sure the Bama 93 is on par for this weather pattern, and will yield the best MPG for the reasons posted above and my 2 cents.

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post #6 of 27 (permalink) Old 06-07-2013
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Good info from JBert.

However, his comment regarding the A/F ratio of the Bama 93 Race tune possibly being leaner than other tunes deserves a little qualifying.
Assuming it is leaner than other tunes, this occurs only during WOT(wide open throttle) operation when the ECU is in the open loop mode, and is getting its air and fuel data from the tune's AFR map(chart).
But during POT(part open throttle), it has the same A/F ratio(14.7) as all other tunes because the ECU is now in the closed loop mode, and is getting a feedback signal from the O2 sensors that primarily controls the A/F ratio.
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post #7 of 27 (permalink) Old 06-08-2013
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Yep, best money saving is the $ saved from 91 to 87 octane. My mpgs have dropped 2-3 since I got my JLT intake and Brenspeed tune, but the tune keeps holding the RPM's so long that doesn't shift much in the city and driving there can be really annoying-like the car just wants to stay at 1800-2000 RPM all the time.

But from my 4000 mile trip a couple years ago, I will tell you now that gas prices will vary greatly from one place to another, depending on where you are going.

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post #8 of 27 (permalink) Old 06-08-2013
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You will see a big fuel mileage improvement if you take state roads and highways instead of the interstate. I get 28-30 mpg going 60-65 on state roads and highways, but I only get about 24 mpg going 70-75 on the interstate.

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post #9 of 27 (permalink) Old 06-10-2013 Thread Starter
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Thanks for all the info. Looks like my trip is about 3000 miles and at 24mpg will use about 125 gallons. Even if the difference between regular and premium is 20 cents, it'll only cost ~$25 more to get premium. Plus then I will have the power and not have to dork with the tune.

Thanks for all the tips/advice
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I get 28-30 with my Detroit Rockers and Brenspeed 93 tune, 65mph, manual trans.

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Quote:
Originally Posted by clwi View Post
I get 28-30 with my Detroit Rockers and Brenspeed 93 tune, 65mph, manual trans.
Seems like the cruising speed is much more important then the tune or maybe even mods. I noticed 60-65 mph is the magic speed for me. If I go faster, my mpg starts to go down.

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Quote:
Originally Posted by markag View Post
Seems like the cruising speed is much more important then the tune or maybe even mods. I noticed 60-65 mph is the magic speed for me. If I go faster, my mpg starts to go down.

Thatís the aerodynamics in play. MY F-150 EcoBoost is the same way, but MORE! At 60-65mph I get 21-22mpg. At 80mph I get 17mpg. The truck is as big as a house though.

I still drive 80 all the time.

Thatís the aerodynamics in play. MY F-150 EcoBoost is the same way, but MORE! At 60-65mph I get 21-22mpg. At 80mph I get 17mpg. The truck is as big as a house though.

I still drive 80 all the time.

And I donít think the tune is going to have much to do with it when working with the S197 chassis. My 2007 gets 23mpg at 80mph with a 718hp/93 octane tune.

It takes a certain amount of energy to move a particular chassis through the air. It doesnít mater much how that power is made. And it takes ďXĒ amount of fuel to make that power.

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And since both those tunes are from AM, they already are an improvement on the stock programming, and most find that they pick up mpg over stock tuning, If they can stay off the juice. Both the 87 and 93 tunes are optimized over stock tunes, And regardless of race tune or not, the race tune still has the capabilities to run good mpg when cruising, then dump fuel like crazy when you jam the pedal. Thats what makes it the race tune, or hybrid tune as they call it now, which is built into every tune. They build every tune good for mpg, on some they give you more low end like the race tune, but they all have the same great cruising attributes.

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Quote:
Originally Posted by money2noise View Post
Hey All,

I have a 2007 gt/cs vert with K&N CAI, hurst shifter and bassani axle back. I also have a Bama tuner and am currently running their 91 "race" tune. In a couple weeks I am going to take the car on a road trip (~3000) miles. Would putting the stock 87 octane tune in the car yield more fuel economy? If I do that, do I also use 87 octane? I am going from higher elevation ~5k' to sea level so I am sure just with air density changes I won't miss the power.

Just curious cause a 1-2mpg increase yields some $$ after 3k miles.
If the tunes are all driven the same way, they're going to get around the same fuel economy. If you're really ripping on it, than it's not going to great gas mileage regardless. However, Highway driving is going to all be pretty similar...

I hope this helps! Hit the Bama team up with any questions you may have. Our Bama Performance tuning specialists are here in the building Monday-Friday from 9AM-5:30PM EST and Saturday 9AM-5:30PM EST. You can hit them up directly at 888.226.9764 and they'll get you squared away!

-Dan

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Regardless of what tune you're using, I would keep your tuner with you and be able to switch to an 87 octane tune if need be. Not everyplace has 93 octane, so keep an 87 octane tune on hand just in case you have to use a lower octane.


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