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Old 10-09-2013, 11:00 PM   #1
wketch22
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Horrible Gas Mileage, Need Help

Hi, I have a 2013 Focus hatchback, I got it in May. Up until recently it has been getting an average of 35 mpg or so, but recently it has DRAMATICALLY dipped. I tested it by resetting when I was driving at around 40mph, and my car was getting roughly 22 mpg.

My only idea why is that recently I ran over a nail. I went to a tire shop and they patched it up. I checked the tire pressure and most were around 30psi, when the recommended is around 35psi. There is no low tire pressure light on my monitor or anything though.

Could that be the reason why my car's gas mileage is so poor now? If I got them all to around 35-40psi would my car get back to around 35mpg?

I appreciate any help. I have to make a 6 hour trip tomorrow, and if I end up paying double what I would normally pay in gas for this it would really suck.

Thanks!


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Old 10-09-2013, 11:05 PM   #2
stclark13
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Increasing the tire pressure may help a little but thats a pretty big drop in mpg's. My guess is gas. Winter blend gas will drop mpg's plus when it starts to get colder out you tend to run a little rich until the car warms up. Not sure what grade you use but i started out using 87 andnwhen i switched to 93 i did see a decent increase in mpg's.

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Old 10-09-2013, 11:09 PM   #3
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If your mileage has dropped by half you have bigger issues than running 5lbs psi low on your tires.
Is it possible your computer is wonky and telling you mileage that isn't accurate, or have you noticed that you're fuelling more often than before?
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Old 10-09-2013, 11:17 PM   #4
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No way is that just the tires..................
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Old 10-09-2013, 11:54 PM   #5
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Quote:
Originally Posted by Leora83 View Post
If your mileage has dropped by half you have bigger issues than running 5lbs psi low on your tires.
Is it possible your computer is wonky and telling you mileage that isn't accurate, or have you noticed that you're fuelling more often than before?
Im thinking the computer must be wonky. I had to pull a fuse on the Ford Sync thing once because it wasn't working, but once I pulled the fuse and put it back in it worked properly again. Maybe I need to do that with this.

I just drove around a bit, and no matter what, when I reset the gas mileage tracker is said 20.5 EVERY TIME. Whether I was at a dead stop, or literally costing at 50 mph. It makes no sense. So I went and filled up all my tires to around 35psi, and I test it out again, and what do you know... Exactly 20.5 every time.

And whats funny is that when I'm at a traffic light, it actually goes up. One time it got up to 25mpg sitting at a light. I really hope thats why. I guess I am going to go find out which fuses to pull and try that again. I have ZERO other idea what could be wrong. It started doing this on the day I ran over the nail, and nothing at all has changed since.
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Old 10-10-2013, 12:17 AM   #6
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The MPG indecator starts at an imaginary figure. And gradually changes as time miles accumilate.
So if you reset it and is reads 20.5 that is the starting mpg set into the system.
As the miles go on and the computer has a chance to adjust it the mpg may climb. even if sitting at a stoplight.
I personally think the op is confused about how the mpg screen system works.
It is NOT instantaneous!! it takes the system time to adjust to the actual conditions. Constantly resetting it just makes it worthless to make any obsevation about mpgs.
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Old 10-10-2013, 01:07 AM   #7
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Quote:
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The MPG indecator starts at an imaginary figure. And gradually changes as time miles accumilate.
So if you reset it and is reads 20.5 that is the starting mpg set into the system.
As the miles go on and the computer has a chance to adjust it the mpg may climb. even if sitting at a stoplight.
I personally think the op is confused about how the mpg screen system works.
It is NOT instantaneous!! it takes the system time to adjust to the actual conditions. Constantly resetting it just makes it worthless to make any obsevation about mpgs.
I appreciate you trying to help, but I know how it works haha.

The car would read 20.5 no matter what was happening, whether I was at a dead stop, or whether I was going 50 on the highway. And it would stay that way, or go down.

But, if anyone else has a problem like this in the future, I managed to fix it. Here is how I fixed it. I pulled out three fuses, the fuse for SYNC, the fuse for the data link connector, and the fuse for the instrument cluster. I'm not sure which of these three reset the monitors that keep track of MPG, but one of them did. I kept the fuses out for a few minutes to let it properly reset, then plugged them back in. I started up my car, prayed to God, and thankfully my MPG when I reset it again while traveling at around 40mph was back to 35mpg!

Thanks for the advice everyone! Hopefully this can help someone else if they ever have this problem in the future. Take care
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Old 10-10-2013, 09:12 AM   #8
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Have you manually checked MPGs?

1) Fill the car completely, and reset your trip odometer

2) Drive like normal!

3) Next time you fill up, record the number of miles on your trip odometer, and the exact amount of fuel it took to refill. Divide the miles by the gallons. (ex, 100 miles on the trip, divided by 4.0 gallons of fuel = 25mpg)

See if your MPG is bad, or just your MPG readout is bad!
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Old 10-10-2013, 09:26 AM   #9
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Quote:
Originally Posted by Romans5.8 View Post
Have you manually checked MPGs?

1) Fill the car completely, and reset your trip odometer

2) Drive like normal!

3) Next time you fill up, record the number of miles on your trip odometer, and the exact amount of fuel it took to refill. Divide the miles by the gallons. (ex, 100 miles on the trip, divided by 4.0 gallons of fuel = 25mpg)

See if your MPG is bad, or just your MPG readout is bad!
yes when in doubt on mpg, this is the real way to figure it out. It will at least tell you if the computer is right and then you know you have a problem.
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Old 10-10-2013, 09:27 AM   #10
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Originally Posted by rambleon84 View Post
yes when in doubt on mpg, this is the real way to figure it out. It will at least tell you if the computer is right and then you know you have a problem.
I'm a big believer in measure twice; cut once. Perform as much diagnostic work as you can on an issue to absolutely be sure of the issue! So many people will be replacing parts and stuff (Well, this one is new enough to just go to the dealer; but even that is time out of his day) before they are even sure of the issue!

On-dash MPG readouts are notoriously generous, and sometimes just flat out wrong.
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