EVIC gas mileage inaccurate
#1
EVIC gas mileage inaccurate
I've taken several (freeway) trips and calc'd mpg by gas purchased/miles driven and the actual is always ~10%-12% less than the EVIC report for the trip.
I see a LOT of people reporting their mpg from "computer" which I assume is the EVIC - is it only my EVIC that is so far off????
Is there anyway to adjust the EVIC mpg figure? It would be nice to have an accurate calculation of Distance to Empty for instance
2009 RAM 1500 w 4.7L, 2WD
I see a LOT of people reporting their mpg from "computer" which I assume is the EVIC - is it only my EVIC that is so far off????
Is there anyway to adjust the EVIC mpg figure? It would be nice to have an accurate calculation of Distance to Empty for instance
2009 RAM 1500 w 4.7L, 2WD
#4
Mine is close to 1/2 mpg off from the EVIC which is no big deal to me.
How much difference are you seeing compared to real world mpg..?
Might suggest having your dealer maybe reflash yours for you..???
In any case, dont put too much faith in those EVIC mpg numbers,
ther`s a good reason why most of us call them "Lie O Meter`s"
I do find, that my "DTE" is right on the money though.
How much difference are you seeing compared to real world mpg..?
Might suggest having your dealer maybe reflash yours for you..???
In any case, dont put too much faith in those EVIC mpg numbers,
ther`s a good reason why most of us call them "Lie O Meter`s"
I do find, that my "DTE" is right on the money though.
Last edited by LU229; 10-21-2011 at 11:33 PM.
#5
Truck is stock, speedometer is dead on (checked vs GPS) mileage never calibrated, but I know the mileage on the Sac to S.Clara trip is the same as my wife measures in her car, and also in my old truck (+/- 1 mile each way)
I get similar % difference around town
Can dealer "flash" it to more accurate numbers?? Or even to put a -10% fudge factor in?
#7
Mine is off by at least 1/2 mpg, even after compensating for the tire size. On the spreadsheet I use, I have both, hand calc and what the EVIC reads. There's been a few times they were close and once the EVIC read below what I got.
The one in my wife's Ford Edge is pretty much the same way, tho.
The one in my wife's Ford Edge is pretty much the same way, tho.
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#8
Similar experience. the EVIC readout is generally high by 1 mpg or less. It is more accurate the more miles I have before fillup. Also have to remember its an average mpg. Also have to remember to reset each time I fill up.
It is also my opinion that even though I fill up till the gas nozzles click off, that full gallons may not be the same each time. My point is if the fill up if even off a gallon can make a difference. as an example
300 mile trip , 17 gallons to fill up , = 17.6 miles per gallon
300 mile trip, 17.5 gallons to fill up = 17.1 miles per gallon
300 mile trip, 18 gallons to fill up = 16.6 miles per gallon
So even hand calc, my opinion is even when I fill up, I may not be starting out with the exact total gallons in the tank as the last time. Being off even 1 gallon can make a difference in mpg.
Bottom line, the evic is an average. Not an exact mpg.
It is also my opinion that even though I fill up till the gas nozzles click off, that full gallons may not be the same each time. My point is if the fill up if even off a gallon can make a difference. as an example
300 mile trip , 17 gallons to fill up , = 17.6 miles per gallon
300 mile trip, 17.5 gallons to fill up = 17.1 miles per gallon
300 mile trip, 18 gallons to fill up = 16.6 miles per gallon
So even hand calc, my opinion is even when I fill up, I may not be starting out with the exact total gallons in the tank as the last time. Being off even 1 gallon can make a difference in mpg.
Bottom line, the evic is an average. Not an exact mpg.
#9
#10
I don't think there is a (down) hill around here long enough to see THAT number!