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  #1  
Old 03-28-2014, 10:18 AM
SHNNGNS SHNNGNS is offline
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Default MPG - Hand Calc VS Computer

I have read some different posts on here about the trip computer displaying higher MPG's vs hand calculating them out. I have stumbled across something that may offer a bite of an explanation. When the truck is in Park and running it does not calculate MPG's (it displays --- instead of "0" when in drive). This means if you use your remote start (or start and let truck warm up/cool down manually) that fuel being burned is not being counted towards the MPG display in your truck. However, your hand calculation uses total miles driven and total gallons used.

Example: If you use your remote start and it uses 1 gallon of gas idling over a tank here is the difference.

You drive 400 miles and use 22 gallons, but only 21 gallons while in Drive.

That would be 18.1 MPG hand calculated (400/22).

However, your display would read 19 because it only sees you burning 21 gallons while in drive, not 22 gallons (400/21).

Thoughts?
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Old 03-28-2014, 10:59 AM
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The one in my 2010 4.7L seems to be close. maybe, within a 1/2mpg.
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Old 03-28-2014, 11:27 AM
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Yes it does meter and factor in idling into your fuel economy. Due to the severity of the winter this year, I used the remote start often. The mileage would always be lower than when I shut the truck down the night before, when I put it in "D".
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Old 03-28-2014, 01:41 PM
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Mine has become more accurate the more I've driven the truck, and my dad's 2009 Ram was the same way. The farther you run our tank down the more accurate it seems to become. I think another part of it may have to do with the truck learning your driving style but I don't know for sure. I now have a little over 13,200 miles on my truck and on my last trip the computer was off by no more than 0.06MPG compared to hand calc at any fillup, which I consider pretty good since the computer only displays MPG to one decimal place. When I first got the truck it was off by about 2.0MPG.
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Old 03-28-2014, 01:56 PM
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Mine is very accurate, not good, just accurate. hehe.
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Old 03-28-2014, 02:24 PM
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I log every tank of gas - date, miles, gallons, & (MPG from the computer). Have for many years, in several vehicles. Hand calc can give some weird numbers once in awhile. 15 mpg on one tank followed by 21 on the next. But this is rare. However, periodically I sit & average the readings. After 5 - 10 fill ups you can get a REAL reading of what kind of MPG you are getting. The computers in the vehicles I have had have NEVER been accurate. Usually about 10% high compared to reality. My new Ram keeps telling me I am getting 19+ mpg - NOT! Reality is a little over 17. I do no idling except at stop lights. Most of my driving is country.
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Old 03-28-2014, 04:52 PM
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The computers are (I think) adding tiny increments of fuel together to come up with their result, and that naturally has to be less accurate than what the gas pump says. Also the computer has no idea of correct miles, while you CAN correct your odometer reading if you want to by using those mileage markers you see on the freeway sometimes. I use the computer display only to help my driving habits, but when I really want to know I calculate it myself.

It is possible, at the pump, to get inconsistent readings. Different pumps might have different sensitivity in the shutoff or different speeds in filling, or the ground may be sloped differently, or the tank temperature may be different (this assumes you fill the same way every time, not topping up some times but not others). To get really accurate numbers you need to average over several tanks, as Blackhawk says. I used to use a spreadsheet to do this but now with fuelly.com I don't bother. So I have the lifetime mpg but not the "last 10 tanks" mpg which makes it harder to see trends, unfortunately.

Here's my other car:
http://www.fuelly.com/driver/paulx/passat
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Old 03-28-2014, 05:09 PM
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I know that my odometer is off by approximately 3 miles per 100
this is because i am not running OEM tires

I have one job that i do often, several other of my competitors do the same trip.
My odometer always reads 133 miles, the other people say that their odometer reads 136 miles.
We all get paid by the mileage driven, so if i used my odometer reading, i would short myself $4.50 every time that i make that trip
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Old 04-04-2014, 11:33 AM
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It looks like some of you reset after every fill. Why not just keep the computer calculating, does it not add the fill amount to a running total. That's what I do.
I have 1900 miles on my truck, maybe 200 miles on the highway the rest is city and winter fuel. I admit I do like to hear the hemi roar periodically. With all that my evic shows 13.4 mpg. Is this not the running total to date? How is this all affected by disconnecting the battery terminals?
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Old 04-05-2014, 10:19 AM
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on my 2013 HFE, I can confirm :

1. the EVIC does include the idle time in the FE calcs
2. my first full tank hand-calc was within 0.2 of the EVIC,
with the EVIC actually lower, but-

as pointed out above, due to the difficulty in 'filling up' the tank to the same point every time,
it is more accurate to look at a running average of the last couple tanks FE..
or, in other words, don't be surprised to see some variability in hand-calc vs. EVIC.

but IMO the EVIC seems pretty darn close...

I use
Trip 1 for the tank-to-tank;
Trip 2 for short sections I'm interested in;
and the main screen FE for longer trip 'legs' e.g. 3-500 mile sections
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