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  #21  
Old 08-15-2011, 12:52 PM
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...It's bad enough I HAVE to run 10% ethanol, and now it may soon be 20%+ ethanol....
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Old 08-15-2011, 02:17 PM
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Just do it manually. Super easy to do anyway when you fill up. You'll get a MUCH more accurate reading than the computer will ever get you and you can be absolutely sure if certain gas gives you any gain or not. I stopped using Costco gas because of the ethanol in it and switched over to Cheveron. They aren't using the 10% here in Cali yet so I wanted to see how much of a difference it made. My wife got 40-50 miles more out of a tank on Cheveron than Costco. Anyway I digress, but do it manually as its much more accurate.
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Old 08-15-2011, 06:07 PM
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I tend to agree that the AVG mileage must be a calculation of the last X amount of miles, because it is WAY to sensitive after you have driven hundred of miles. Meaning like previous poster said, reset it, go on a LONG trip, then when you get home it is very sensitive to city driving, much like it would be after 50-100 miles of highway driving.
This could also explain the difference people are getting with the manual calculation vs computer. GM does what we all think, just keeps calculating, also enjoyed the total fuel used calculation GM has. Then when I traded my truck after 60k miles, I could do a calc and know what I got for mileage in 3 years.
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Old 08-15-2011, 06:12 PM
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My EVIC is not sensitive at all after many miles, even to city driving. I really believe it calculates from when you reset it. Mine is only sensitive in the very beginning after a reset.
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Old 08-15-2011, 06:29 PM
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Quote:
Originally Posted by snrusnak View Post
My EVIC is not sensitive at all after many miles, even to city driving. I really believe it calculates from when you reset it. Mine is only sensitive in the very beginning after a reset.

x2

Same thing with mine.
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Old 08-16-2011, 05:18 AM
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I mainly drive my truck back and forth to work (about 15 miles). Haven't reset since I got the truck, and yesterday I let the wife take the truck to work with her while I slept. After her 1 day of driving my EVIC showed a drop of .5 MPG (her drive is only 4 miles). After averaging fuel for well over 1000 miles, a total of 8 miles of driving (even if you floored the hell out of it) shouldn't have changed it at all... I'm on the 50-100 mile AVG bandwagon!
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  #27  
Old 08-16-2011, 07:55 PM
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The problem with most of the avg read outs is they do not properly take into account the durations that you sustained high MPG compared to the brief durations of lower MPG.

On an 890 mile trip this weekend of all highway driving the EVIC said I averaged 17.4mpg. Hand calculated to 15.4mpg. 800 miles were driven at highway speed with a 2000lb boat on the back. Read out displaced 15.8 and I averaged at 14.8 and 15.4 at both fill ups. The last 90 or so miles was done at 55mph, MDS was working and I could watch the average climb to 17.4.

Based on this here is what I deduced on how it is calculated.

A finite array of instantaneous fuel mileages are stored and after the array is full an average is calculated. The array resets, fills and finds a new average and compares that average with the existing one, and this repeats indefinitely and at very small mileage/time intervals to provide the driver a readout that updates. This style of calculation does not take into account weighted mileage(how long you maintained a certain fuel usage)

This could also be completely wrong, however, I do know the mileage average is not a direct calculated value as it would require massive amounts of memory and computing power to constantly log all the instantaneous values and keep them in memory. They can probably store 256 data points before they need to dump memory.
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  #28  
Old 11-01-2011, 07:23 PM
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Cudase, I think you are right in your hypothesis about how the mileage is calculated. It is some kind of moving average. That explains why it is so sensitive.

A better algorithm would be to just store two numbers, the mileage traveled since reset, and the fuel consumed since reset, Then make the division every few seconds.
Both of those numbers are already captured in the computer.

I wonder if it could be reporogrammed to do that?
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