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Old 12-18-2016, 07:15 AM   #1
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Gas mileage too good to be true?

I'm not sure if it's a glitch or real. I bought my car on Sept 19 2016. The last AVERAGE gas mileage reading before I reset it was 57mpg. I DO drive a lot of highway, but 57mpg AVERAGE? That seems unreal high. Anyway, I reset it and it's about 37 now. Since Sept, it just kept getting higher and higher. Should I trust that mpg calculator or should I get them to check it on my first oil change?


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Old 12-18-2016, 09:21 AM   #2
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I wouldn't believe 57... Do you know over how many miles that was calculated? I could see getting a reading like that over just a few miles, and driving mostly downhill. :)

I get ~32 from everyday driving, and into the high 30s on the interstate.
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Old 12-18-2016, 09:58 AM   #3
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I got into the 50s too when I was hypermiling mine too.
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Old 12-18-2016, 10:58 AM   #4
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On my way from Asheville, NC to Charlotte, NC I was able to achieve 57 MPG. It is a slight down hill the whole way, and I didn't make any aggressive moves.

That said, I typically get about 37 week to week. I drive 90% highway. When I'm driving in town a lot I'll get closer to 32-33.

The calculation gets more accurate the longer your drive. If you reset the meter and start to drive from a stop you'll see it start at about 40 MPG and just start tanking. I'm not sure why they decided to average the gas mileage with a starting point that isn't 0.
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Old 12-18-2016, 11:16 AM   #5
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How often do you reset it and how many miles per tank are you getting calculated by hand? Are you getting almost 600miles pertank?
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Old 12-18-2016, 11:28 AM   #6
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Quote:
Originally Posted by RonMaiden View Post
How often do you reset it and how many miles per tank are you getting calculated by hand? Are you getting almost 600miles pertank?
^^^ this...calculate by hand to see if the numbers matches

Also...what engine your have ... ?? The 1.0L ecoboost?

If so that would make sense
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Old 12-18-2016, 11:52 AM   #7
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Every time I buy gas, I mentally roughly approximate the miles per gallon.
Sometime mt actual use is a little higher, sometimes lower. But within 10%.
If you really are getting 57mpg. Then a tank of gas IS getting you:
57mpg times 12 gallons = 684 miles.
The odometer is pretty correct. So..
Do you get over 600 miles per tank as another person mentioned?
If so, then yes you ARE getting 57mpg.
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Old 12-18-2016, 02:25 PM   #8
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Quote:
Originally Posted by zehkaiser View Post

The calculation gets more accurate the longer your drive. If you reset the meter and start to drive from a stop you'll see it start at about 40 MPG and just start tanking. I'm not sure why they decided to average the gas mileage with a starting point that isn't 0.
That's typical for all I've played with in different vehicles, similar to how when you take your foot out of it while cruising an instant meter pegs at the max in the system, like 100 MPG, even if 5 is more typical for an average.

There's a bit of a delay before getting an average once reset, and the starting point is typically high because you haven't done anything yet to lower it. It's later after more idle time or hard acceleration that more fuel has been used than miles tacked on and the average drops.

It relates to reality in that almost anything you do but coasting downhill results in a loss of MPG. Press the pedal and use more fuel, don't press the pedal and you come to a halt eventually, still burning more fuel from idling & not moving. There's nothing you can do to GAIN MPG, all you can do is minimize losses.
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Old 12-18-2016, 02:29 PM   #9
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Quote:
Originally Posted by sailor View Post
It relates to reality in that almost anything you do but coasting downhill results in a loss of MPG. Press the pedal and use more fuel, don't press the pedal and you come to a halt eventually, still burning more fuel from idling & not moving. There's nothing you can do to GAIN MPG, all you can do is minimize losses.

Agree...but engine size does matter for this case.

We mostly have the 2.0L...this number is impossible to achieve unless going downhill for miles with the wind pushing the car. (fuel cut-off most of the time)

The 1.0L is a different matter... I have no idea how low you can granny it.
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Old 12-18-2016, 04:03 PM   #10
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Quote:
Originally Posted by sailor View Post
That's typical for all I've played with in different vehicles, similar to how when you take your foot out of it while cruising an instant meter pegs at the max in the system, like 100 MPG, even if 5 is more typical for an average.

There's a bit of a delay before getting an average once reset, and the starting point is typically high because you haven't done anything yet to lower it. It's later after more idle time or hard acceleration that more fuel has been used than miles tacked on and the average drops.

It relates to reality in that almost anything you do but coasting downhill results in a loss of MPG. Press the pedal and use more fuel, don't press the pedal and you come to a halt eventually, still burning more fuel from idling & not moving. There's nothing you can do to GAIN MPG, all you can do is minimize losses.
I should have been more clear. I meant that it is odd that I can reset the MPG while the car is parked, then start driving and after about 30 seconds 40ish MPG will pop up as the average and rapidly start dropping, because I'm accelerating. Instead of start at 0 and climbing, the computer starts at some inflated number and falls from that as real data accumulates. My old Lincoln used to display "real" numbers for me. I guess people like when their cars lie to them, so the dealers have started fudging the numbers...
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