PickWicksMerc

Hi everyone, what a great forum..

Long time reader, first time poster.

So my white c250 coupe is misbehaving... the fuel consumption "bar" showing the average mpg while driving, goes up to the max 20L/100km when the car is idle, or under the 10km/h speed..between 10-20 km/h it starts moving towards the middle..and once the speed picks up above 20 km/h it goes back to normal, showing average fuel consumption related to the atual driving and mileage i get..so i know that no fuel is leaking..and my consumption last 1000km was about 7l/100km so that checks out...

as far as know the only consequence from this is that it artificially inflates my mpg if i stop often...last 1000km were on a a highway so didn't have this issue..but would like to get it fixed now that i am back in town..

any ideas what it might be?

before this i did have another seemigly unrelated , issue with the ABS ESP skid control lights coming on and cruise control being inoperative, until i stop the car and start again..it comes and goes every 500km or so so i ignored it ...
Thanks!

rocky raccoon

When idling without forward motion you are in fact getting zero miles per gallon.

PickWicksMerc

very enlightning! thank you for your contribution, in fact.

obviously this is the case, yet the fuel consumption scale is showing the max 20l/100km consumption, and the estimated range is rapidly decreasing when this occurs. This is the problem.

Jota 75

Hi there. I have the same problem. When the car is stopped, it shows 20l/km , and the average comsumption is near 15 l/km , is so high. What could be the problem? Did you solve the problem in your car?

Thanks

Black5

As per the previous advice, this is perfectly normal.
This gauge is only useful when the car is in motion.
If the car is not moving you would effectively require an infinite amount of fuel to move 100km, so as the gauge maximum is 20 l/100km, this is what it will show...

Jota 75

ok. thank you. but then I have another question, yesterday I was trying a W205 C250 2015 and when stop, the consuption indicator was in zero, so I´m confuse. And the avarege consuption was 7 l/100 km, mine is 15 l/100 km, something should be wrong don you think? best regrads,

Black5

When the car stopped, did the engine stop?
The BE (Blue Efficiency) engine switches off when the car is stopped, so will not use any fuel.

Fuel consumption while driving is more a function of the driver and the type of driving than the engine efficiency alone, so to know whether this was normal or not we would need to know the driving conditions in great detail.

Average consumption at steady speeds and good roads could easily be 7l/100km, and city or spirited driving could also easily exceed 15l/100km.

Neither result by itself is indicative of any problem, you would have to consider many other factors as well...