[Dutchy]

Quote: Originally Posted by nonsequitur

This has been bothering me... so today I was able to try several experiments with the Cooper CVT because my wife is out of town (she's "acquired" the '02 as "hers" for work and the commute, over my consistent protests).

Cruising at highway speeds.
Reset the computer MPG and MPH.
The OBC "jumps" to a new number, and then settles into an average that matches the speedometer (2-3% optimistic). This seems completely as expected. The "sweet spot" still appears to be somewhere around 57mph (from the OBC) for the best ave mpg.

Stopped on a flat surface, engine running, I.
Reset the computer MPG and MPH (both read "- - -".)
The OBC does absolutely nothing. No change in MPG or MPH.

Stopped on a flat surface, engine running, II.
Don't reset the computer for MPG or MPH (retain existing numbers in memory).
Ave MPG steadily drops down in 0.1 Mile/Gal steps.
Ave MPH steadily decreases in approximately 0.4Mile/Hour steps (this is dependent on hour much data is in memory).

Headed steep downhill, throttle off.
Reset the computer MPG and MPH at the top of the hill.
Ave MPG pegs at 99.9mpg, and Ave MPH quickly crawls up to the actual number.

Headed steep downhill, throttle off.
Don't reset the computer for MPG or MPH (retain existing numbers in memory).
Ave MPG starts increasing (fast or slow, depending on how long data has been accumulating in the OBC; recent reset = fast; lots of previous time = slow).

Thanks for the test, it shows that your OBC is working as it should be. My main problem is when at rest, the fuel consumption goes up through the roof to what should equate to racing around a track at full throttle. When in motion, though, the fuel consumption drops as it should when lifting off the gas and cruising. Stop and it goes up again!!!!

Dutchy.

[nonsequitur]

Quote: Originally Posted by Dutchy

My main problem is when at rest, the fuel consumption goes up through the roof to what should equate to racing around a track at full throttle.

But,... isn't this is exactly what should happen?

Sitting there without moving means that No Miles are being logged into OBC memory, therefore miles per gallon goes way down (fuel consumption "goes up") .

[ToplessRed]

Ok, did some experimenting on engine braking versus using brake pads MPG. The better MPG may be more due to driving style & psychology than any physics.

When I tap the brakes to make a turn, the car slows down quite a bit and I have to hit the gas again when I come out of the turn. When I downshift before a turn, the car doesn't actually slow down that much but I just get the psychological impression that I can navigate the turn with more control. So some people probably experience less gas used for slowing down/speeding up when turning.

[Dutchy]

Quote: Originally Posted by nonsequitur

But,... isn't this is exactly what should happen?

Sitting there without moving means that No Miles are being logged into OBC memory, therefore miles per gallon goes way down (fuel consumption "goes up") .

In theory, yes. But my OBC reads up to 30 L/100 kms, I have yet to find anyone else here on M2 that has the same readout with their OBC. I guess it is reading fuel used for the number of klms travelled - this would rise when stationary. If it read AVG fuel/gas actually used at any one point, then it should drop. When I have the actual fuel consumption displayed on my speedo (2003 model, so has to be done manually), it reads about 9-10L/100klms when driving and 0L/100klms when stationary and zero acceleration, this should then drop the Litres used per 100 kilometres (raise mpg).

Anyway, this is OT. I think the discussion is changing from engine braking versus braking. I really don't see a difference, because I don't apply the clutch until almost stopped, so I basically do both. When I used to have an auto in my celica, I used to change down the gears as well - four speed auto. This eliminated the delay in kickdown when I tried to accelerate again, with out stopping. It was more fun too!

Dutchy.

[nonsequitur]

Quote: Originally Posted by Dutchy

But my OBC reads up to 30 L/100 kms, I have yet to find anyone else here on M2 that has the same readout with their OBC. I guess it is reading fuel used for the number of klms travelled - this would rise when stationary. If it read AVG fuel/gas actually used at any one point, then it should drop. When I have the actual fuel consumption displayed on my speedo (2003 model, so has to be done manually), it reads about 9-10L/100klms when driving and 0L/100klms when stationary and zero acceleration, this should then drop the Litres used per 100 kilometres (raise mpg).

I understood that the OBC reads out in the Tachometer, all models worldwide, not the Speedometer?

Our display reads just the opposite (Miles/Gallon) of the one you describe (Litres/Kilometer), so I would guess you have a display option engaged that we didn't know was there! MINI has many selections that can be "programmed" into the EMS2000 and the OBC. There are many, many code combinations, some of them quite interesting.

You should just ask the dealer to change it to the way you want it.