2006 1.4 fuel consumption

My c3 gets 370 miles on 40 litres is this good? Also why does the mpg keep going up and down for example it says on the computer 68mpg then goes down to 28

Jjb0800 wrote: ↑Wed Nov 11, 2020 7:40 pm Also why does the mpg keep going up and down for example it says on the computer 68mpg then goes down to 28

Hi

You are probably looking at the instantaneous MPG and not the average.

The instantaneous will drop as you accelerate or go up a hill and use more fuel but if you just coast along or go downhill the MPG will get very good.

Tap the controls to cycle through to the Average and reset it. You will get a much more overall useful figure for your fuel consumption.

Jjb0800 wrote: ↑Wed Nov 11, 2020 7:40 pm My c3 gets 370 miles on 40 litres is this good?

40 litres used in 370 miles equals 42.05 Miles per gallon or 6.72L/100Km according to https://www.mpg-calculator.co.uk/

My Diesel will easily get over 65MPG averaged on a tank of fuel. But your petrol will do less and by how much less would all depend on the way you drive and things like the load you carry and how well the car is running.


[quote"http://www.auto-abc.eu/Citroen-C3/v10054-2005"]The fuel consumption of this version of Citroen C3 1.4 in combined mode (combining urban and highway driving) is 6.1 litres per 100km. The capacity of fuel tank is 45 litres, which means you'll be able to drive up to 720 kilometers without refueling in urban cycle.[/quote]

Oh i see thanks for that, in that case the second mpg that stays solid shows 26.2 mpg why is this so low or is my 02 sensor faulty?

My average (indicated) is 7.3 litres per 100Km or 32.2 miles per gallon. I have checked this against the actual distance covered Vs the fuel consumed and it's accurate.
I have no reason to believe that the engine isn't running as well as it can. The output from the upstream O2 sensor does not show a rich mixture. My other C3 averaged about 8L/100km running the same trip to work? Again I have no reason to believe the engine wasn't running well. Sorry, but I cant explain it.
They are the facts...make of them what you will.
There are a number of factors that affect the average MPG. Mostly city stop/start Vs highway driving. If you do a lot of 'city' driving the average will be low. The other thing is that the 'average' indication is VERY slow to react and may take weeks to settle on the real average (after it has been reset). You can watch the instantaneous MPG and sort of average it out for your self. See what an average value mostly is.
P.s. my engine is the 1.4i TU3JP 8 valve.

Oh ok my driving is mainly short distance like 5 miles a day no harsh breaking or acceleration, also i have noticed that on my drive there is like a watery like conistency leaking a little it did have the head gasked replaced

Jjb0800 wrote: ↑Thu Nov 12, 2020 4:44 am Oh ok my driving is mainly short distance like 5 miles a day no harsh breaking or acceleration, also i have noticed that on my drive there is like a watery like conistency leaking a little it did have the head gasked replaced

Soak some up with a clean paper tissue.

You can tell what it is/isn't from the colour (pink coolant) and if it's oily (oil, brake fluid) or not and what is smells of (petrol) or it's just water (air con outlet, rain water) or even screenwash (maybe blue, sometimes smells of alcohol)

Ozvtr wrote: ↑Thu Nov 12, 2020 4:31 am My average (indicated) is 7.3 litres per 100Km or 32.2 miles per gallon. .

Just done a quick calculation as the mpg looked low to me. This is correct for miles per US gallon (1 US gallon = ~3.8L) but it is ~38.5mpg per Imperial gallon (1 gallon = ~4.5L), which is a bit more like it.

SSSHHH!! Don't tell anyone, but I wrote the software for the thrusters on the Mars Climate Orbiter.

Just checked the mpg again and its worsened! Im getting 22mpg and also fully tanked it to 39.5 litres and reading on dashboard said 305 miles, surely there is something wrong??