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post #11 of 21 (permalink) Old 04-28-2015, 05:02 PM
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I only have a dumb phone and an ipad 1 3G, (yes it still works fine).

I'm going to order an HP Stream 8 ($149) with free 4G wireless for life from T-Mobile (as long as I don't sign up for cloud storage or office 365 I'll never exceed the monthly freebee limits) from Amazon soon.

Until then I'm flying blind.


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Last edited by solar365; 04-28-2015 at 05:04 PM.
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post #12 of 21 (permalink) Old 04-29-2015, 02:11 PM Thread Starter
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Quote:
Originally Posted by Caliche View Post
Interesting. Would you always reset the AVG MPG after setting Cruise Control or before, or both? Just curious. Don't know why the difference other than wind. What about the hwy lane? Always on the same? I wonder if pavement friction varies on all lanes (if you weren't always on same lane).
The AVG MPG was always reset AFTER cruise had been set and was steady. I would set the cruise as I came up to the state line and reset the computer at the sign every time.

I tried to stay in the left most lane, but would move to avoid drafting behind vehicles. All lanes are paved together, though, so it shouldn't be a factor.
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post #13 of 21 (permalink) Old 04-29-2015, 02:14 PM Thread Starter
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Quote:
Originally Posted by jaren253 View Post
dont forget, you are also breaking in your engine at just over 10k miles.Any other factors could be
-side winds
-tire pressure due to temp
-a/c / defroster running
-grooves in road
-quality of gas
-cargo in car
-windows open or closed
-Side winds could have absolutely been an issue
-Tire pressure changes due to temp are nearly neglibible and would have shown a MPG relationship to temperature if that were the case
-A/C was never running and nor was the defroster at that point in my trip
-The pavement is sub-par, but it was the same 8.8 mile section of pavement every day
-Always filled at the same station with 87 octane
-Always just me and my briefcase. I noted fuel tank fill as it was the only change in weight.
-Windows always closed

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post #14 of 21 (permalink) Old 04-29-2015, 02:21 PM Thread Starter
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Quote:
Originally Posted by tickerguy View Post
The average MPG meter is just that, an average. You might THINK you hit the reset at exactly the same point but you did not since you don't control when the sample period for each point in the average begins, and that matters.

9 miles is simply not very far when you could be a half-mile or so on either side of the first data point's "average start." Put enough miles on after a reset to account for a couple of gallons through the system (~60ish miles) and you should find that the numbers converge.
I was hitting reset at the NC/SC border every time. This is marked by a sign and a severe degradation in road surface. If I was off by more than a few feet with my reset or didn't have the cruise control locked in, I wouldn't take data that day.

With that in mind, it was the exact same 9 mile stretch for every datapoint. The AVG MPG updates on a time frame, so my final reading would post at the same point in the trip as well.
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post #15 of 21 (permalink) Old 04-29-2015, 02:41 PM
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I still say that a 2.07 mpg standard deviation is negligible when you take into consideration all the factors present in such a small amount of data.

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post #16 of 21 (permalink) Old 04-29-2015, 02:41 PM
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Quote:
Originally Posted by Donkey Grundle View Post
my final reading would post at the same point in the trip as well.
That is all the proof you need that the sampling was consistent.


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post #17 of 21 (permalink) Old 04-29-2015, 02:48 PM Thread Starter
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From the owner's manual:

Quote:
This mode displays the average fuel
economy by calculating the total fuel
consumption and the total traveled
distance since purchasing the vehicle, reconnecting
the battery after disconnection,
or resetting the data. The average fuel
economy is calculated and displayed
every minute.


To clear the data being displayed, press
the INFO button for more than 1.5
seconds.
After pressing the INFO button, - - - L/
100 km (- - - mpg) will be displayed for
about 1 minute before the fuel economy is
recalculated and displayed.
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post #18 of 21 (permalink) Old 04-29-2015, 02:51 PM Thread Starter
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Quote:
Originally Posted by solar365 View Post
That is all the proof you need that the sampling was consistent.
I really wasn't upset by the inconsistent numbers, either. I was hoping that there would be a correlation between the MPG reading and temperature, humidity, or vehicle weight (fuel level).
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post #19 of 21 (permalink) Old 04-29-2015, 03:25 PM
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All this science is very intriguing guys, cool. What about the cruise control itself, I mean, on the M6 GT the cruise control is digital, but how reliable is that setting for sure? I mean, I've seen my digital cruise control displaying at 70 mph at the same time that I've seen my GPS displaying 71 or 72 mph, and the needle almost at 71. So are these things really exact, accurate, or just approximations? They don't seem to jive exactly the same with each other, at times anyway, so I wonder if some calibration may be needed for more accurate data. Just wondering.
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post #20 of 21 (permalink) Old 04-29-2015, 07:25 PM
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Quote:
Originally Posted by Caliche View Post
All this science is very intriguing guys, cool. What about the cruise control itself, I mean, on the M6 GT the cruise control is digital, but how reliable is that setting for sure? I mean, I've seen my digital cruise control displaying at 70 mph at the same time that I've seen my GPS displaying 71 or 72 mph, and the needle almost at 71. So are these things really exact, accurate, or just approximations? They don't seem to jive exactly the same with each other, at times anyway, so I wonder if some calibration may be needed for more accurate data. Just wondering.
I would just assume the DCC is getting info direct from the speed sensor same as the speedometer, and there is always some amount of error in speedometers. When I drive by the radar read outs on "SLOW DOWN" signs I'm always within about 1mph of what it's showing, which the most accurate of any car I've ever owned. My miata speedometer registered about 4 mph too fast, most BMWs are in the 5-10mph too fast range.


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