Ford Mondeo fuel consumption question...

cyclonebri1

AdrianHi wrote: »

Every time winter approaches people on car forums start posting about how their fuel consumption is rising.
I see mine drop about 10% over winter compared to spring / summer figures.
For all this talk of air con affecting MPG, I just don't see it happening to my current or previous car. Both of these cars had climate control aka automatic air conditioning though.

I agree, I expected this to improve with denser air mix etc, but I noticed a similar drop in mpg, guess its something to do with winterised diesel being less efficent. I don't think its lights, wipers etc.;)

AdrianHi

cyclonebri1 wrote: »

I agree, I expected this to improve with denser air mix etc, but I noticed a similar drop in mpg, guess its something to do with winterised diesel being less efficent. I don't think its lights, wipers etc.;)

No not that, winterised diesel is actually more efficient, this and the denser air together are not enough to compensate for the simple physics of a cold airflow sucking energy out of the engine and the heaters on in the car.
Some mechanical engineers have also speculated that the intercooler is optimised for around 15DegC.

sarge123

Conor wrote: »

59.7 MPG on Asdas finest diesel. No additives. Whacking on the aircon drops it by 2-3MPG. 04 plate 2L TDCi 130.

Conor,
Is that reading of 59.7 via the trip computer or your own working's out?
I also see you have the '130' engine. I'm sure mine is the '115' 5 speed option.

Conor_3

sarge123 wrote: »

Conor,
Is that reading of 59.7 via the trip computer or your own working's out?
I also see you have the '130' engine. I'm sure mine is the '115' 5 speed option.

It's taking into account the inaccuracy of the trip computer which was worked out over several tanks. The trip computer actually showed 62.8 but it's about 5% out. Working it out on fuel used for the odo reading corroborates it.

6th gear makes a bit of difference - I reckon it's good for 2 MPG if you get enough chance to use it. I know I only managed to break 59MPG once I started using 6th gear.

As for Adrian, I get plenty of practice Did just short of 500 miles yesterday alone. Only 300 odd today - was on locals.:D