Fuel consumption

[MikeTB]

My suspicion is that the figures are done at relatively low speeds. My indicated consumption at motorway speeds drops very rapidly. Hate to think what you get at the (claimed) 129 mph top speed.
It would be interesting if anyone can report their indicated consumption at- say  -70 mph and 80 mph (let's be realistic).
Meanwhile the only good thing about the current CO2 figures is the saving on Road Tax. One day the DVLA will realise how artificial the figures are.

[BigAl]

I spend quite a bit of time on motorways and I generally set the cruise control to 72 which gives a true 70 on the sat nav. Sometimes I'll set it at 70, giving a true 68. At those speeds, over long distances, I've achieved 46-48 MPG on several occasions. However, push it even slightly above that and the fuel consumption sky-rockets. It's almost as if it's programmed to use excessive fuel to penalise you for breaking the speed limit? I know aerodynamics accounts for a lot of this, but the change is too abrupt for that to be the whole cause.

Alan

[BigAl]

I know this probably won't have the slightest effect, but at least I've tried...
Have set up a petition on the government website regarding making changes to the way that official MPG figures are generated.
Please sign if you agree that the current system is flawed and needs changing.
http://epetitions.direct.gov.uk/petitions/70952

Alan

[rmvf]

just to agree with previous posts I did the v power experiment in a mazda 6 diesel nearly 3 years ago and mpg improved by 5 MPG no change in driving styles.

[twabrigs]

I know this probably won't have the slightest effect, but at least I've tried...
Have set up a petition on the government website regarding making changes to the way that official MPG figures are generated.
Please sign if you agree that the current system is flawed and needs changing.
http://epetitions.direct.gov.uk/petitions/70952

Alan

have signed and share on FB Alan

[BigAl]

Thanks!

[padgman]

Just topped up after first 500 miles in my new CX5D 150 2wd.  Av 52mpg (measured by fuel use not what car told me, but quite accurate) which I thought was very good for new car! This included Motorway, A and B roads with 5 up for part of it.  Driving to speed limits where possible. Showing av of 55mpg until I got on M'way.  Former driving instructor so quite good at eco driving (when it is your biggest expense!) and take manufacturers claims as a challenge.   

[Pirate983]

Had my CX5 since June 2014 and have got some good MPG of mid 50's to even 62MPG!! Not on mainly urban drive of course, but even then am getting around 48MPG. Got the 2.2D 150 Diesel

[BigAl]

Just an update on fuel consumption, since I've now been using Shell V Power diesel (almost) exclusively for the last 10,000 miles.

From that point, the average fuel consumption has been 43.62MPG, with a cost/mile of ?0.15.
Prior to that (previous 35k miles), it was 40.86MPG, also with a cost/mile of ?0.15 (due to a lower basic fuel price).

Alan

[McHarry]

BigAL, looks like I may go down the V-Power route also. My last two tanks brim-to-brim gave just under 32MPG....Jeez my Honda Stepwagon 2.0 petrol auto did better than that! 

[MikeTB]

Getting really fed up with fuel consumption. My mileage is low (just 5000 after a year) but consumption is not improving at all.
I record every fill up, and just managed to get below 32 mpg on one (partial) tank.
Overall my computer says 37.4 but calculated figure is about 1 mpg less.
Motorways are worse. Any climb at all brings consumption into 20s and low 10s on steep hills. Mostly only me in the car.
I have the spare wheel which must be at least 20 Kg so doesn't help.
Mostly I use V-power, but sometimes it is not possible as few pumps have it.
My 1994 Probe with Mazda V6 petrol did 30 MPG+ on motorway journeys, usually at higher speeds than I do in the CX5. Best was over 34 mpg.
Seems crazy that this super-economy vehicle needs to be driven so gently to keep fuel consumption reasonably low.

[ianbram]

Hey BigAl,

Totally agree with you - I too love almost everything about my CX5 excepting its fuel consumption and trip computer.
I picked up my CX5 in Feb 2014 and have since done 16k +- miles and am only getting around 44 mpg (from pump calculation).
I no longer trust what the trip computer tells me as it fluctuates so frequently across such a great range.
Dealership just told me that it should fluctuate!!! They seemed to think that 44 mpg was good.

Ian
 

[howardsathome]

I am now up to 14,000 miles. Through out Dec my trip computer average has been 40. Actual full tank to full tank 38/39 mostly local but one 400 mile round trip 75% Motorway. During Recent trip Midlands to Devon/Cornwall computer dropped to 39 and actual full to full around 37/39.
I still love the car but not impressed with mpg against claims. My wife's 10 month old MAZDA 2 petrol achieves 40+ mostly round town with few long runs.

[BigAl]

Just to prove that it can be done (well almost).

Took this yesterday on the M6, just over 50 miles after a fill up (V-Power) in Blackburn on my way back from Glasgow. Cruise control set at 70, 50.4 average MPG indicating. It actually reached 51.7 MPG shortly after, but then I hit Stoke On Trent... Trouble is that it lulls you into a false sense of achievement - the average for the whole trip was just under 43MPG (calculated, not from the trip meter).

Alan.

[DHZ7945]

It's getting better