Summer/Winter Diesel

GunJack

Anyone have an idea of whenabouts garages switch between summer/winter diesel in the pumps happens please?

No issues, just curious....

MEM62

I was not aware that they did.

E30M3

starts in November and ends in March

Edit - both end on the 15th of the month

reeac

Probably the same day when everyone changes from Summer to Winter tyres. Consistency spells safety.

System

MEM62 wrote: »

I was not aware that they did.

They do. It has a higher amount of kerosine in to prevent waxing in the cold temperatures. You typically notice a drop in economy of 5% or so when running on it.

My fuel economy has gone back up to high 50's over the last couple of tanks compared to low 50s since the back end of last year so I can only assume that around the beginning of March they switched over to summer.

DUTR

Tarambor wrote: »

They do. It has a higher amount of kerosine in to prevent waxing in the cold temperatures. You typically notice a drop in economy of 5% or so when running on it.

My fuel economy has gone back up to high 50's over the last couple of tanks compared to low 50s since the back end of last year so I can only assume that around the beginning of March they switched over to summer.

Isn't that just coincidental with the lower average temperatures?
My petrol car uses more fuel in the winter, possibly due to less longer journeys, more convenience consumer items in use and the lower ambient temperatures.

GunJack

DUTR wrote: »

Isn't that just coincidental with the lower average temperatures?
My petrol car uses more fuel in the winter, possibly due to less longer journeys, more convenience consumer items in use and the lower ambient temperatures.

It tends to be a combination of factors...as you state above plus diesel has the extra "disadvantage" of a different mix. Still more economical than a petrol, though...

System

DUTR wrote: »

Isn't that just coincidental with the lower average temperatures?
My petrol car uses more fuel in the winter, possibly due to less longer journeys, more convenience consumer items in use and the lower ambient temperatures.

Unlike a petrol car a diesel doesn't have a "cold start" period where it runs a richer mix for several minutes or so whilst the engine warms up. The heater blower in my car has been on the same speed, the temperature setting makes no difference, it has been doing the same journeys as it basically just drives a 56 mile round trip to work and back. If it was down to the temperature then it would have risen when we had the very mild spells this winter.

DUTR

Tarambor wrote: »

Unlike a petrol car a diesel doesn't have a "cold start" period where it runs a richer mix for several minutes or so whilst the engine warms up. The heater blower in my car has been on the same speed, the temperature setting makes no difference, it has been doing the same journeys as it basically just drives a 56 mile round trip to work and back. If it was down to the temperature then it would have risen when we had the very mild spells this winter.

Ambient temperatureI refer to is the outside temperature, my CC is on 21c from when I had the car, I never change it summer or winter. But yeah my short 6 mile commute, I notice a definite difference in MPG between the winter months and summer.

Apodemus

Tarambor wrote: »

If it was down to the temperature then it would have risen when we had the very mild spells this winter.

Mine did and has dropped back again this week.

Lots of parameters at play here, including the effect of temperature on tyre composition.