CX-5 fuel issues

[cx-5lk]

Hi

My CX-5 seems to getting a lower than expected fuel economy. The agents claim that it should do less than 9L/100Km and mine shows 12.3L/100Km or more. Today the agents said the A/F sensor may be blocked internally so to run at high RPM to clean it. Tried that but it doesn't seems to work. This evening I drove the car (city limits) and recorded some of the PIDs using FORScan. The O2S11 and MAF readings seems wrong. Do any of you have knowledge/seen these PID values and advice me what is wrong. If I know if any setting is wrong I can start shouting at the agents demanding a proper troubleshoot. Any help is appreciated.

I have attached a zipped CVS of FORScan readings.

thank you.

 

[cx-5lk]

One other issue is the ambient temperature shown in the meter cluster is about 3 or 4 degrees high. When I called the agents they claimed the temperature may not be accurate due to the engine heat which I cannot believe. Don't Mazda has some kind of adjustment to the reading to make it close to the correct ambient temperature?

 

[Chris_Top_Her]

all depends on how you drive I avg 22 mpg usually 28mpg on a trip when im trying to save fuel

 

[Dr_Watson]

If you drive at 50mph, cruise control on, in 6th gear on a level road, what is the instantaneous fuel consumption reading?

 

[Bon Scott]

I'm averaging 11-12 litres per 100 kms. At first I was annoyed as that was not what I had expected.....but I got used to it. Still love the vehicle.

Bon

 

[Jrgee72]

I have been getting 7.4 l/100km or about 700 km per tank so i am very pleased. Most cars a very sensitive to driving styles so I try to cruise the car on the highway between the 6-7 km/100km range.

The 7.4l/100 km works out to 31.7 mpg for my American friends.

 

[dougal]

I am in the US, so have no idea what this is in L/100 KM, but I am getting a very consistent 27 MPG in my city driving. Once the weather warmed up, the mileage just got better and better. Really pleased with this. I got cheap gas (2.88/gallon) so I drove pretty hard and almost all in manual mode and I still got 27 MPG.

 

[cx-5lk]

If you drive at 50mph, cruise control on, in 6th gear on a level road, what is the instantaneous fuel consumption reading?

will try it tomorrow and give you the figures.

 

[cx-5lk]

I'm averaging 11-12 litres per 100 kms. At first I was annoyed as that was not what I had expected.....but I got used to it. Still love the vehicle.

Bon

I too love the vehicle, except that I have feeling that there is an unsolved problem with some of them. 7-9L/100Km is what I am expecting...

 

[CXVille]

The single most important factor in fuel mileage is the DRIVER. Period. Everything else is a distant second, assuming the car is running correctly. You need to find a long FLAT stretch and see what the mileage is there. You need to write down every mile you drive and every drop of fuel you put in it. You need to write down other information like what the trip computer says, temperature, driving conditions, load, etc. Very detailed notes. All can significantly impact mileage. The data file you provided is way more trouble for me to try and wade through 15,000 lines of information at 1/2 second intervals than I have time to do.

12l/km is about 19 mpg for us in the US. That is not good, but not unheard, of depending on your driving. Are you going up and down hills a lot? Running with a load? Stop and go driving? Bad gas?

 

[Dr_Watson]

A doctor can take care of bad gas.

 

[cx-5lk]

If you drive at 50mph, cruise control on, in 6th gear on a level road, what is the instantaneous fuel consumption reading?

did it, the CURRENT shows between 6.5L/100Km to 7.5L/100Km, but it jumps above and below very fast.

I checked the fuel trims last night running idle and at 2500rpm. At these engine speeds long term trim was between 4%-5% and short term trim almost always positive and between .5% to 4% or so. The fuel pressure was 2995Kpa to 3050Kpa going up and down. What can be the problem?

 

[cx-5lk]

If you drive at 50mph, cruise control on, in 6th gear on a level road, what is the instantaneous fuel consumption reading?

did it, the CURRENT shows between 6.5L/100Km to 7.5L/100Km, but it jumps above and below very fast.

I checked the fuel trims last night running idle and at 2500rpm. At these engine speeds long term trim was between 4%-5% and short term trim almost always positive and between .5% to 4% or so. The fuel pressure was 2995Kpa to 3050Kpa going up and down. What can be the problem?