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  #1  
Old 09-13-2009, 01:03 PM
MRRMX MRRMX is offline
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Default MPG reading- Correct?

Ok...If I am traveling 55 MPH and hit the reset and it reads 18.6 MPG and I travel 18.6 miles. This is a true reading of the mileage im getting Correct?
The MPG did not very much during the 18.6 miles it went up and down by tenths.
I did do a tank fill up to tank fill up and compared it to the Trip info display
It was off by .6 MPG low if I did the miles/gallons put in. 15.1 MPG the trip info display had this week VS my math which showed 15.7 MPG Suburbs/ Expressway driving.
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Old 09-13-2009, 03:41 PM
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No gas pump is going to be the same, and how was the milage during acceleration. trying it with only "one gallon" is way to much work and wont be very accurate. Here is what you need to do. Next time you go on a road trip if you do. Drive at a constant speed for the entire tank of gas with as little heavy acceleration as possible and calculate the whole tank not just 1 gallon of gas.
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Old 09-13-2009, 05:30 PM
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Well all gas pumps should be the same . They are calibrated frequently . Easiest thing to do is do it by the tank full . My cars system said on my trip back from Fla. that I was getting 23.7 mpg. But I did the calcultions on paper and I got 22.9 . So I wouldn't take it to be 100% accurate . I think it gets you in the ballpark .
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Old 09-13-2009, 06:04 PM
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The 18.6 miles was a 55 MPH with one stop sign, two 40 MPH zone and Flat. I drove as some would say old man or sunday driver. Get me on the Interstate and I do 10 over for the most part. I never seen it go under 18.1 MPG when throttling up to 55 MPH.




Quote:
Originally Posted by incubusfan03 View Post
No gas pump is going to be the same, and how was the milage during acceleration. trying it with only "one gallon" is way to much work and wont be very accurate. Here is what you need to do. Next time you go on a road trip if you do. Drive at a constant speed for the entire tank of gas with as little heavy acceleration as possible and calculate the whole tank not just 1 gallon of gas.
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  #5  
Old 09-13-2009, 08:06 PM
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I would not rely on the computer to tell you the correct mileage. I'd use the old fashioned way to determine actual mileage:

Miles traveled / gallons used.

It never fails.
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Old 09-13-2009, 09:13 PM
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Quote:
Originally Posted by MRRMX View Post
The 18.6 miles was a 55 MPH with one stop sign, two 40 MPH zone and Flat. I drove as some would say old man or sunday driver. Get me on the Interstate and I do 10 over for the most part. I never seen it go under 18.1 MPG when throttling up to 55 MPH.
Just go with the old fashioned way Miles traveled vs Gallons used, it is a fail safe.
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Old 09-14-2009, 06:58 AM
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Quote:
Originally Posted by Toms Blue Ram 1500 View Post
Well all gas pumps should be the same . They are calibrated frequently . Easiest thing to do is do it by the tank full . My cars system said on my trip back from Fla. that I was getting 23.7 mpg. But I did the calcultions on paper and I got 22.9 . So I wouldn't take it to be 100% accurate . I think it gets you in the ballpark .
This is correct, which is why, on my '07 Jeep, the EVIC said "average" miles per gallon, but, as has already been said, miles vs. gallons is the best way to go if you're looking for an "exact" number.

However, people expect the reading to be the same all the time, which is not going to be the case. I drive exactly 24 miles to work, along the same route. One day, it will be a smooth ride, no traffic, keep it in cruise and just go. The next day, I may catch the light red or have to gun it to dodge someone else. Even these little discrepancies in driving patterns will throw the numbers off. Heavy acceleration vs. not or stop and go vs. steady rollin' all make a difference, but it really does conform to the law of averages.
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Last edited by CajunDodge; 09-14-2009 at 07:05 AM.
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  #8  
Old 09-19-2009, 10:24 AM
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my 06 according to the computer gets an average of 22 mpg. driving to and from work average speed of 45mph.If this is true I am very happy with this Hemi!
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Old 09-19-2009, 11:08 AM
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I'm a believer in the tank/ mileage version. I tend not to trust computers to tell me these kind of things.
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  #10  
Old 09-19-2009, 12:23 PM
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Quote:
Originally Posted by Toms Blue Ram 1500 View Post
Well all gas pumps should be the same.
I think the implication is that all pumps shut off at slightly different times not that the amount they report is incorrect. The take away being that you can't know you filled up the tank the exact same amount, so you can't know exactly how much gas you used.

I may be wrong though, I am of course assuming the perspective of another person, always a dangerous assumtion.
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