Post-Tune: MPG concern - Mustang Evolution

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Old 11-16-2012, 01:07 PM   #1
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Question Post-Tune: MPG concern

Anyone else have this happen? I received my tuner from Bama (awesome tune btw).

After the tune was complete, on a 3/4 of a full tank, I saw my "miles until empty go up from around 200 miles, to about 275 miles. Now I know this tune may help with efficiency, but that is a little extreme.

To make matter worse, my MPG is not really significantly higher, so I hav eno idea why the car is registering my tank is 75 miles fuller than it was before.

I just filled up the tank to see if it would reset back to normal, and now that I have a full tank, it shows 330 miles until empty. Typically, it shows 270-280 miles.

What gives? I'm not getting such an increase in MPG, so why is it telling me I have more miles until empty?

tj
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Old 11-16-2012, 01:29 PM   #2
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Quote:
Originally Posted by Klaximilian View Post
Anyone else have this happen? I received my tuner from Bama (awesome tune btw).

After the tune was complete, on a 3/4 of a full tank, I saw my "miles until empty go up from around 200 miles, to about 275 miles. Now I know this tune may help with efficiency, but that is a little extreme.

To make matter worse, my MPG is not really significantly higher, so I hav eno idea why the car is registering my tank is 75 miles fuller than it was before.

I just filled up the tank to see if it would reset back to normal, and now that I have a full tank, it shows 330 miles until empty. Typically, it shows 270-280 miles.

What gives? I'm not getting such an increase in MPG, so why is it telling me I have more miles until empty?

tj
A few people on here have claimed that even when it says 0 miles til empty they can go quite a few miles, perhaps done by Ford to make sure you don't run out of gas. Maybe the tune gets rid of that threshold and you see an actual estimate.
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Old 11-16-2012, 01:57 PM   #3
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16 gal tank divided by +60 miles = +3.75 miles/gallon. Sure it's not just benefits of the tune?
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Old 11-16-2012, 02:32 PM   #4
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The same thing happens when you unplug your battery and hook it back up. It has to relearn all the fuel trim strategies for your driving habits and idle. It did not turn your stang into a gas sipping yaris. You may benefit another 1-2mpg possibly but that will fade away due to it being more fun to drive. Watch how quickly your miles to empty drops on this tank.
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Old 11-16-2012, 03:22 PM   #5
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Old 11-16-2012, 04:26 PM   #6
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Quote:
Originally Posted by wheelman View Post
16 gal tank divided by +60 miles = +3.75 miles/gallon. Sure it's not just benefits of the tune?
according to the mpg gained after the tune, I'm at most 1mpg over what I was getting before.

---------- Post added at 02:26 PM ---------- Previous post was at 02:25 PM ----------

Quote:
Originally Posted by DWC_SmOziLLa View Post
The same thing happens when you unplug your battery and hook it back up. It has to relearn all the fuel trim strategies for your driving habits and idle. It did not turn your stang into a gas sipping yaris. You may benefit another 1-2mpg possibly but that will fade away due to it being more fun to drive. Watch how quickly your miles to empty drops on this tank.
Well, my first tank did not dip at all. I was almost on empty and it said I have 100 miles left. I knew it was wrong.

I hoped a refill would correct the issue. It didn't.
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Old 11-16-2012, 04:36 PM   #7
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Quote:
Originally Posted by Klaximilian

according to the mpg gained after the tune, I'm at most 1mpg over what I was getting before.

---------- Post added at 02:26 PM ---------- Previous post was at 02:25 PM ----------



Well, my first tank did not dip at all. I was almost on empty and it said I have 100 miles left. I knew it was wrong.

I hoped a refill would correct the issue. It didn't.
Right after any tune, the computer will have to relearn how far you drive on a tank. So until it does, it defaults to 200+.

With my tune, my mpg is probably a bit worse city only driving then before... Depending on how aggressive I drive. But even driving super conservative, it is 1 mpg less than before. Again, all city driving. That is using the 93 race all the time.
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Old 11-16-2012, 04:50 PM   #8
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Quote:
Originally Posted by Klaximilian View Post
Anyone else have this happen? I received my tuner from Bama (awesome tune btw).

After the tune was complete, on a 3/4 of a full tank, I saw my "miles until empty go up from around 200 miles, to about 275 miles. Now I know this tune may help with efficiency, but that is a little extreme.

To make matter worse, my MPG is not really significantly higher, so I hav eno idea why the car is registering my tank is 75 miles fuller than it was before.

I just filled up the tank to see if it would reset back to normal, and now that I have a full tank, it shows 330 miles until empty. Typically, it shows 270-280 miles.

What gives? I'm not getting such an increase in MPG, so why is it telling me I have more miles until empty?

tj
Quote:
Originally Posted by DWC_SmOziLLa View Post
The same thing happens when you unplug your battery and hook it back up. It has to relearn all the fuel trim strategies for your driving habits and idle. It did not turn your stang into a gas sipping yaris. You may benefit another 1-2mpg possibly but that will fade away due to it being more fun to drive. Watch how quickly your miles to empty drops on this tank.

Hey,

Smozilla said it correct! This is your system relearning your fuel trims and strategies etc... Give it a tank or two and it should be ready to go. If you're still having the same occurrence give my Bama team a call and they'll look into your file for you!

I'm glad to hear you're enjoying our tune though! Thanks for the props we really appreciate it.

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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Old 11-16-2012, 06:59 PM   #9
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Great, thanks Dan and everyone else. Will wait it out another tank or two and see what happens.
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Old 11-18-2012, 04:05 PM   #10
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I believe we have 16.5 gallon tanks. I notice I usually have 2.5 gallons left when the light comes on.
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Old 11-18-2012, 04:47 PM   #11
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Quote:
Originally Posted by UltArc
I believe we have 16.5 gallon tanks. I notice I usually have 2.5 gallons left when the light comes on.
They are 16...
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Old 11-18-2012, 05:07 PM   #12
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I filled mine up today I got 245 should I b concerned
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Old 11-18-2012, 05:36 PM   #13
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I filled mine up today I got 245 should I b concerned
what is your MPG at?
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Old 11-18-2012, 06:03 PM   #14
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Quote:
Originally Posted by nosympathy

They are 16...
My bad, I was wrong. I was thinking about my wife's truck, it is 16.5 and I confused the two. My mistake. I have been thinking we were at .5 for so long, that puts most of my calculations off a bit ...
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Old 11-18-2012, 06:17 PM   #15
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what is your MPG at?
Probly like 18
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Old 11-18-2012, 06:56 PM   #16
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My bad, I was wrong. I was thinking about my wife's truck, it is 16.5 and I confused the two. My mistake. I have been thinking we were at .5 for so long, that puts most of my calculations off a bit ...
lol...no biggie. I wasn't trying to be an *** with that comment.

Could be worse, first month I had the car I thought it was a 19 gallon tank. I DK where I got that idea from, probably one of the many other cars I was debating between. Started driving her and based on doing some math in my head I was like, "wow this comp isn't even close, no way am I getting 16mpg with this car!

haha
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Old 11-18-2012, 07:18 PM   #17
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Quote:
Originally Posted by nosympathy

lol...no biggie. I wasn't trying to be an *** with that comment.

Could be worse, first month I had the car I thought it was a 19 gallon tank. I DK where I got that idea from, probably one of the many other cars I was debating between. Started driving her and based on doing some math in my head I was like, "wow this comp isn't even close, no way am I getting 16mpg with this car!

haha
Didn't take it rude, I just try to man up and say I am wrong when I am wrong. Often people just avoid it or make an excuse, and well, I was wrong lol.

I always just do mileage times .027 plus mileage divided by fuel put in for my mpg. Just had a 400+ mile trip, should be around 35 mpg for it. The hills of PA killed my mileage.
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Old 02-20-2013, 05:45 AM   #18
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Well I just tuned mine and I get 330 on a full tank
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Old 02-20-2013, 06:07 AM   #19
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Well I just tuned mine and I get 330 on a full tank
Your still on relearn process, once your new tune adjusts to good driving habits, it will change... Most spirited drivers like me will probably get 180-200 miles to empty on average
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Old 02-20-2013, 08:23 AM   #20
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How long dose the relearn possess take
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