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  #25  
Old 04-19-2012, 06:59 AM
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Re: EVIC Gas Mileage Accuracy

One pattern I do notice is every time I START the Jeep, I see a 0.1 drop in the EVIC mileage. Seems odd that starting would have such a drastic effect on 2K's worth of cumulative mileage results.

Not trusting the EVIC so much anymore...
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  #26  
Old 04-19-2012, 08:54 AM
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Re: EVIC Gas Mileage Accuracy

I just filled up this morning, the EVIC showed 15.0 and my calc was 15.5. Most of the time it is off by 1-2 mpg.I never reset it either.
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  #27  
Old 04-19-2012, 10:08 AM
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Re: EVIC Gas Mileage Accuracy

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Originally Posted by plynn7 View Post
I just filled up this morning, the EVIC showed 15.0 and my calc was 15.5. Most of the time it is off by 1-2 mpg.I never reset it either.
So if you never reset it, your EVIC indicates avg. MPG since last reset not necessarily MPG since the last fill-up. Am I missing something here?
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  #28  
Old 04-19-2012, 10:25 AM
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Re: EVIC Gas Mileage Accuracy

Ever since I've had vehicles which display the MPG, I don't even bother calculating by hand. You think calculating by hand is 100% accurate? Do you top-off at the pump? Even if you top-off, do you think "Full" is always at the exact same level? Do you fill at the exact same pump, always? If not, do you think all pumps shut off at the same exact level? I answer "no" to all these. Thus, I don't bother calculating manually. I go by what the display reads (I reset at every fill-up). There's too many variables when filling gas (pump gauge, temp, shut-off times, etc). If anything, the EVIC could be most accurate.
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  #29  
Old 04-19-2012, 11:07 AM
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Re: EVIC Gas Mileage Accuracy

I have to agree 100% with kkreit01.
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  #30  
Old 04-20-2012, 08:30 AM
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Re: EVIC Gas Mileage Accuracy

It is still more accurate than the EVIC gives by doing it yourself. The variables you are mentioning couldn't make it off by more than a quarter gallon and on a 24 gallon tank that would just throw your mileage off by a couple of tenths.
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  #31  
Old 04-21-2012, 04:45 AM
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Re: EVIC Gas Mileage Accuracy

I was wondering about this too. I've been using my trip function lately and my EVIC shows 15.3 avg MPG, but I'm at 510 miles on my trip odometer with approx. 50 DTE left after I filled up a few weeks ago. Adding in the 20 miles or so that I put on the Jeep, before I reset it and adding in the DTE, that's 500+ miles for 1 tank of gas in my Hemi. It's crazy, because this is all city going 35-45 mph, with no stop and go traffic, and the MDS on about 95% of the time.
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  #32  
Old 04-21-2012, 08:19 AM
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Re: EVIC Gas Mileage Accuracy

Sounds like a neighbor has been adding some gas at night (old VW joke). Either that or your odo is reading km.
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  #33  
Old 04-21-2012, 10:59 AM
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Re: EVIC Gas Mileage Accuracy

The EVIC has been pretty consistent for me so far. I just reset before I leave the gas station each time.

One thing I have noticed though is if I ever just sit in my car running with the AC on, the avg drops pretty significantly (around 1 mpg for 30-45 minutes in the car). Does that sound normal?
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  #34  
Old 04-21-2012, 04:07 PM
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Re: EVIC Gas Mileage Accuracy

Depend, of course, as to how many miles after the reset.
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  #35  
Old 04-21-2012, 06:00 PM
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Re: EVIC Gas Mileage Accuracy

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Originally Posted by neilattack View Post

One thing I have noticed though is if I ever just sit in my car running with the AC on, the avg drops pretty significantly (around 1 mpg for 30-45 minutes in the car). Does that sound normal?
When idling you are getting 0 MPG, so yes, that would be normal.
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  #36  
Old 04-22-2012, 11:07 AM
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Re: EVIC Gas Mileage Accuracy

EVIC will be more accurate than the fill-to-the-pump-shutoff method unless you can insure the fuel level in your tank is exactly the same every time. Just a slight incline at a gas station can make the fuel pump shutoff come on sooner and then there is also the pumps that may shut off too soon or too late. Averaging fill ups over time and comparing EVIC over time is the best way to compare and mine is withing a tenth or two. Close enough for government work.

Fuel metering is computer controlled for high precision fuel injection operation to enable fuel economy and power. The EVIC runs off the computer so what you use and how far you go with that usage is pretty darn dead nuts spot on. Flow metering is very accurate in modern computer controlled engines.
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