Anyone else getting closer to 10/11 mpg in snow?

alexman · Post by **alexman** » Wed Dec 22, 2010 7:51 pm

So says the computer..

Maybe tyres slipping more on average giving it this estimate?

Post by **Wondermike** » Wed Dec 22, 2010 9:41 pm

The constant freezing temperatures won't be helping. If you reset the counter once the engine has warmed through a bit, a more normal mpg should resume. Not driven mine for z few weeks.

mmm-five · Post by **mmm-five** » Thu Dec 23, 2010 2:22 am

Have done about 500 miles over the last 2 days and averaged 25mpg according to the OBC at an average of 68.4 miles an hour

Daffy · Post by **Daffy** » Thu Dec 23, 2010 9:02 am

Both my 330 and the M are returning particularly poor gas mileage at the moment.

I don't really want to calculate the MPG as it'll just make me miserable. I'll just keep plugging the fuel in and pray for better weather.

Darren M · Post by **Darren M** » Thu Dec 23, 2010 1:33 pm

29.1 mpg here, reset it about 2 weeks ago. THat' carrying a boot load of weather related gear around (overnight bag, shovel,multiple pairs of shoes and jackets) in case I get snowed in somewhere and doing speeds up to 69.99 ONLY (of course

). However, once the engine is started I usually don't stop for 50+ miles so lots of warm running. Also using small diameter winter tyres also which probably affects the fuel consumption negatively.

I will assume you are doing town driving and not driving very far after each start?

bmwangler · Post by **bmwangler** » Thu Dec 23, 2010 2:30 pm

Even my 320d is returning a good 5mpg less than normal at the moment.

lacroupade · Post by **lacroupade** » Thu Dec 23, 2010 2:47 pm

A lot of it will be down to the MAF sensing the much colder (and therefore denser) air and squirting more fuel in....my diesel 4x4 is practically leaping about at the moment because of it, but fuel consumption is down 15-20% even in 2WD.

aerobod · Post by **aerobod** » Fri Dec 24, 2010 3:37 am

I would suggest the only significant effect on mileage in cold temperatures is due to more fuel used during a cold start and more idling due to traffic issues. If you have to use a lower gear to push fresh snow, then you can use more fuel, but you will feel the extra resistance to movement, much like climbing a hill. When the snow is tracked, then you don't have that extra resistance.

Cold temperatures have negligible effect on mileage on a fully warmed up car (assuming winter petrol with a higher ethanol content is not being compared with summer petrol that some stations switch between here in Canada, but I always use E10 petrol year round). Just came back on a 300km trip today in -10C weather, the roads were clear and dry, I was cruising between 100 and 120km/h. Doing the same trip at the same speed in +20C weather gives me exactly the same fuel consumption - between 10 and 10.5 l/100km (27 to 28mpg).

Aliv6 · Post by **Aliv6** » Wed Dec 29, 2010 3:53 pm

wooter · Post by **wooter** » Thu Dec 30, 2010 4:23 am

I did a pathetic 500+ km on one tank! That is 29 mpg...

Sad thing is that my top speeds go down, but my average speeds barely drop.

Aliv6 · Post by **Aliv6** » Thu Dec 30, 2010 10:03 am

Back up to 20.3 today! Breathtaking!

mmm-five · Post by **mmm-five** » Thu Dec 30, 2010 12:18 pm

wooter wrote:I did a pathetic 500+ km on one tank! That is 29 mpg...

Sad thing is that my top speeds go down, but my average speeds barely drop.

You do know it's a 12 gallon tank, so more like 26mpg

wooter · Post by **wooter** » Fri Dec 31, 2010 9:39 pm

I kid you not.

http://www.spritmonitor.de/en/detail/349915.html

Check the 21/12 refueling.

mmm-five · Post by **mmm-five** » Fri Dec 31, 2010 10:03 pm

wooter wrote:I kid you not.

http://www.spritmonitor.de/en/detail/349915.html

Check the 21/12 refueling.

The benefit of driving anywhere other than the UK, I see.

That's also a useful tool for checking how fuel prices have gone over the last year or so.

Z4-forum.com

Z4-forum.com