Pardon my ignorance, but is that a B48 motor in that puppy?

Cheers,

Charlie

 

nope sorry.. didnt see the G3 in the heading.. its an N14 JCW

 

I reset my trip computer at every fill up so my data’s pretty useless.

 

I feel bad for you. Slowest speeds worst gas mileage. I'm guessing lots of city driving.

 

Please folks, can I have some more B48 JCW data?

Thanks very much,

Charlie

 

This is data from my '02 R53 so feel free to ignore it - but it illustrates what happens if you keep resetting the mpg/mph computer. (These are GPS figures since I don't have a digital dashboard).

Four trips: across town, highway, highway & back across town. Reset between each.
4 miles - 22mph moving average - 16mph overall average
10m - 61 - 60
26m - 66 - 63
7m - 30 - 24
My overall mpg for the last 38,000 miles is 27.1.
So my mpg+mph scores are 49, 88, 93 & 57
Today I have a 250 mile trip, 80% highway. I'll see what my score is tonight.

I'm still not sure what this is all telling us.

 

99% city driving. It's fun though

 

Update:
217 miles - 56mph moving average - 49mph overall - score=83

 

So, did a little semi-controlled data validation experiment.

Last Wednesday I did the exact same run I do almost every Wednesday. It's about 15 miles. Mostly stop and go with one 2-mile stretch of non-stop 60MPH on a flat, straight road at sea level.

So, last Wednesday, I filled my tank at my Wednesday gas station. Top tier, 91 octane, California Winter Blend. Clear skies, moderate temp, no wind. Then I started my MINI, reset my trip mileage meter and drove off from the gas station and did the above run. Did NOT use the automatic start/stop. Kept the car in normal mode and let the automatic tranny shift all by itself. Drove the route using the driving style I always do for this run. Moderate city driving. 28 average MPG showed on the trip meter at the end of the run.

Today, a week later, exact same run, similar weather. Gassed up at the same station. Only this time, I set the car to auto start/stop and then drove out of the gas station and, as I was rolling down the road at about 30MPH immediately after leaving the gas station, I pushed the trip meter reset. Of course, the first reading on the average mileage readout was close to 60MPG as I was basically coasting along at around 30MPH until I came to the first red light.

For the remainder of today's run I retraced the exact route I did last Wednesday, with the car in normal mode and the auto tranny doing all the work by itself. 36MPG showing on the readout at the end of the run.

Not particularly scientific, and 15 miles is a short run. But my point is obvious. There is so much variability in results when any variables are changed -- in my case we added auto start/stop AND the car was rolling when the trip meter was reset, throwing the average mileages way high.

As we all try to understand living in the new world of Big Data, it is wise to remember, as with most things in life, it's the variables that must be accounted for prior to drawing any meaningful conclusions from data.

 

Just for the record, mine's an automatic.

 

Thanks all.

Here I have segregated the data to see what happens...

Automatic, Manual, and our JCW Modded MCS... The data labels are Avg. Speed.






Cheers,

Charlie

 

Please folks - may I have some more data?

Who's driving a manual transmission out there? We've more paddles than sticks?

Cheers and thank you,

Charlie

 

Anyone?

Cheers,

Charlie

 

Here's an outlier for you!


26.8 avg speed
21.2 avg mpg


I drive my car hard, REALLY hard. I went through a set of brake pads in 10,000 miles and I'm half way through my second set of tires.


And on that subject, I think a person's driving style will affect their fuel economy significantly more than just the balance of highway or city driving they do. As you can see by my average speed compared to others, I'm not on the highway a lot, but on the city streets I will admit that I speed everywhere. And when I get on the highway, there's a stretch between home and my dealership that I can get up to 130ish without fear of getting caught.


I'll be interested to see the results!

 

Just bought a 2018 JCW 6-speed.

Not quite 800 miles on the car yet so doing the break in thing, keeping things under control but varying RPMs and load. While this type of usage helps break in it doesn't help MPG...

Just filled up the gas tank this AM on the way to work. Distance driven 202 miles. 28.5mpg. 35.5mph average speed.

Not sure I can recall the type of driving. Some highway/freeway. Some town running around. A few kind of hard acceleration runs still not using full throttle and keeping RPMs under 4500.

 

Thanks to both of you for chiming in - here's the results so far.



The data:



Note that if we sort by average mileage, there is no inverse relationship with speed.

 

Another fill up (well, 7.29 gallons..., not that I'm complaining) for my 2018 JCW 6-speed.

Odometer: 935 miles
Trip: 196.1
MPG: 27.8
MPH: 35.7

How about another trip? Just tonight.

61.5 miles.
29.7mpg.
41.6mph.

This trip was mostly highway/backroads. On the back roads I didn't push it. The roads are unfamiliar to me, it is dark, and in places foggy. And the roads were rural and I recall just 2 weeks after getting my 2003 996 Turbo hitting a mule deer on a rural road (out in Nevada). (Just to be clear I wasn't pushing the Turbo either. Similar conditions: Dark. Foggy/overcast with rain. And a road -- highway 50 -- I had never been on.) I certainly didn't want a repeat of that horrible experience. So I wasn't pushing the car at all on the back roads.

On the highway/freeway traffic was heavy but moving at the limit in most places and I was keeping up with traffic.

 

So - a little rumination.

Note that the mileage and speed averages I started with have never been reset in my car - they are life to date over 9,000 miles. In my case the mileage number has risen steadily for the first several thousand miles, and leveled off in the 28.7 to 28.9 range.

It's tempting to change my approach and using the "Average Reset" function of the on board computer begin to collect data on a trip by trip basis. RockC makes the point that there is quite a bit of variability.

The data we've collected blows a few pet theories of mine out of the water.

1. I can drive efficiently and will get among the highest mileage (nope)
2. The sum of average mileage and average speed will be limited to 70, because the faster the car drives the poorer the mileage will be (nope)
3. The manual transmission will return better mileage than the automatic (nope)

Thanks again to all contributors.

Kind regards,

Charlie

 

I've always calculated or written down mileage/etc. on a per fill up basis. My driving is pretty consistent day to day and even when I venture out on long trips -- none so far with the JCW -- I often stop at the same gas station, even the same pump, stay at the same hotel, eat at the same restaurants.

My technique is to after filling up the gas tank -- letting it fill until the nozzle shuts off (and sometimes if I feel it has shut off prematurely turning on the ignition to check the tank is full) -- then in the car with the engine running I write down the odometer, trip odometer, and if the car offers it, mpg, average speed, and range.

Then I reset these and just drive until the next fill up. On long road trips I can sometimes fill up 2 even 3 times. Gets kind of interesting with my credit card company when it gets 3 gas station charges sometimes from stations hundreds of miles apart and often in 2 even 3 different states.