Mpg

[scottydee]

Now that the weather has become a little colder I have noticed that my MPG has dipped. My journey to work usually sees me arriving with around 40mpg showing; now we have the cold snap, this has dipped to around 35mpg!
Could this be because the cold air is denser and therefore can absorb more diesel?
Any thoughts?

 

[Troon]

Now that the weather has become a little colder I have noticed that my MPG has dipped. My journey to work usually sees me arriving with around 40mpg showing; now we have the cold snap, this has dipped to around 35mpg!
Could this be because the cold air is denser and therefore can absorb more diesel?
Any thoughts?

Car has to warm up, more ancilliaries (wipers, lights, heaters); and winter diesel with its anti-waxing additives is less energy-dense.

Your air density theory is correct in theory, but the car won't deliver more diesel unless it needs to produce more power.

 

[72 dudes]

Have noticed a similar drop in MPG with my A180 CDi. Definitely down to the colder weather, but I don't recall quite such a noticeable drop with my previous diesel cars. Perhaps MB diesels are more susceptible?!

 

[KennyN]

Mine is down 25% during the colder months , 26 average in the summer down to 21 recently.

Doing a 2 mile trip to work just doesnt let the motor get up to anywhere near the optimum running temp.

Kenny

 

[ghibbett]

Yes mine has dropped 3-4mpg over the last month.

 

[geraldrobins]

Cars also take longer to get to operating temperatures as well in winter months.
Also do automatics gearboxes take longer to warm up than manuals?

 

[Deleted member 6183]

Using heated seats, rear heated windscreen, leaving on the drive to warm up?

 

[vealige]

I'm down from around 20 to 16mpg but I have been hitting the loud peddle more then usual roads have been clearer so can stretch the AMGs legs a bit more.