Average MPG Duration

[Longshot270]

Well you dont necissarily need to reset it for it to move. I figured you were talking about sitting at a light for 30 seconds. Lets say you have 1200 readings(20 minutes) of 17 mpg. Average in 360 readings (6 minutes) of 0 mpg or idle and you end up with about 13 mpg. If you had an hour (3600 reading) of 17 mpg driving you would still get dropped to 15.5 avg mpg.

And this was using an average of 17 mpg because I've heard of better and worse averages (and its pretty much what mine gets), if you went up a hill and had to give it some gas, that could lower the sample for those few seconds. Averaging that with a zero will make an even bigger impact.

[88Racing]

My readings are continuously high also.
The same thing happens when sitting at a light the read out drops only about .1-.2mpg.
On the other hand when I get into it my average goes up by 3-5mpgs then after about 10 miles of hwy driving it levels back out.
I'll stick with the hand calculations over the digital readouts any day.

[AZFX4]

There is alot of people saying it reads high and it drops alot when idling at stoplights or what not.

[Jackpine]

Originally Posted by AZFX4

There is alot of people saying it reads high and it drops alot when idling at stoplights or what not.

And, if we're at the "stabilized" 100,000 sample calculation, all we're doing is multiplying by 100,000, adding zero and then dividing by 100,001 each second. Doesn't look to me like much would change.

After 30 seconds of zero mpg at a stoplight, and assuming a "stabilized" Avg Econ reading of 15.5, the equation is: 15.5 x 100000 / 100030 = 15.49535, which "rounded" is still 15.5. And I still get 15.49071 after 60 seconds. After 2 minutes, it's 15.48142, which is still "15.5". At this rate, looks to me like we could sit for at least 5 minutes, before we'd see 15.4.

Maybe the Mad Doctor will enlighten us when he returns.

- Jack

[88Racing]

So if a person typically resets after every tank they are not getting the full effect of the AVG MPG. They should wait and reset after 4 tanks? Or don't reset at all?
The only reason I bring this up is if a person does reset it at every fill up then there would be less samples to draw from thus sitting at an idle would have a bigger drop? Am I applying the right reasoning?

[martinoledad]

i always reset mine when i get on the highway for more then about 50 miles. but where i live there is alot of hills so i get horrible MPG until i get about 35 miles west of where i live

the average MPG that comes on the truck not gryphon.

[Longshot270]

Originally Posted by 88Racing

So if a person typically resets after every tank they are not getting the full effect of the AVG MPG. They should wait and reset after 4 tanks? Or don't reset at all?
The only reason I bring this up is if a person does reset it at every fill up then there would be less samples to draw from thus sitting at an idle would have a bigger drop? Am I applying the right reasoning?

Yep, but as I said earlier 4 tanks is not always the 28 hours. I could burn through 4 tanks about 16 hours depending on how much I drive. I would only reset it after maybe you make a large change. As in when they change from winter to summer gas or if you put on new tires. Once you start getting past 50K readings the mileage isn't going to change much.

Haha, its a shame the gryphon cant record run time like some of those bike odometers. Mine will show how many minutes/hours I've have been riding the bike for. I wonder if Bill could add a feature like that to the gryphon. It probably wouldn't be hard if he can because the gryphon records engine run time for the average mileage anyways, 1 reading per second. Take the readings and divide them by 3600 and you have runtime hours. But I dont know much about the development capabilities on his side. As far as I know he could make the gryphon shoot out fire and sparks if he wanted.

[Big L]

Okay I feel better now. Thought it was just my unit.

The only thing that makes sense is that it does not use 100,000 samples at 1 second apart. Either it uses less samples or many more than 1 per second.

We will have to wait for Bill to give us some accurate numbers on this matter and possibly increase the duration the average mpg uses.

[ticopowell]

I have also noticed the same thing, The idea that it resets too much to be too accurate im not sure if i agree with, it makes sense, but i have never purposely reset the grypon, I have unplugged it 2-3 times since i have had it, but i drove to Utah (8-9 hours), drove around there quite a bit (2-3 hours) drove to Wyoming (3-4 hours),drove back to Utah(another 3-4 hours), drove around a lot there(2-3 hours), and drove back to Colorado(another 8-9 hours), drove around here for at least 2 tanks now and I haven't reset it since, but it still seems to drop rather quickly, quicker than it should after 100,000 readings.
I also agree with the statement that they are just going to be inaccurate no matter how you do them.