Fuel consumption

[Tigerobe]

Hi guys

Got my14 leon fr diesel fully serviced on the weekend, filled up the tank and noticed that the fuel consumption has dropped from average 51mpg to just shy of 45. I haven’t changed the way I drive nor have the journeys been any different.
Any advice guys?


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[CUPRoAr]

This could probably be down to a drop in ambient temperature. Have u noticed that recently its colder near u?
I usually get about a 10% loss in mpg in the winter when compared to the summer.

 

[BoomerBoom]

Do you mean the long term mpg, since refuel or since start?

The first one will be impacted by the service itself, if the car was left idling for long periods.

 

[Big Col]

the garage used your car for the breakfast roll run and then the mcdonalds lunchtime run.

 

[SRGTD]

Filling stations will now be selling winter formulation diesel fuel (prevents the fuel ‘waxing’ in the car’s fuel lines in really cold weather). Winter diesel isn’t as efficient as normal diesel, so is likely to be contributing to your reduction in mpg.

 

[Tigerobe]

Do you mean the long term mpg, since refuel or since start?

The first one will be impacted by the service itself, if the car was left idling for long periods.

The mpg since refuel


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[C_ED_99]

The mpg since refuel


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The dealer will have taken it for a run to check for faults and may have left it idling.

 

['Little' John]

My guess would be winter diesel.

 

[KXL]

Oh hello, I thought it was in my mind too! Please see here: https://forums.seatcupra.net/index....ice-ibiza-1-0-ecotsi-dsg.447401/#post-4812911

Some say it's the ECU reset, some say it's a WLTP software upgrade, some say is changing the oil properties (my case, it was long life to normal service oil, from Castrol, to Texaco oil). My experience is, despite the 'lower' mpg claimed by the trip computer, I can still do the same approx amount per tank of fuel. Me thinks, it's not the winter fuel, as my service was mid-winter...and it was blantantly obvious that it read 'lower'after the service...

 

[LouG]

This is why actual calculated consumption is the only reliable measure.
I use the fuelio app for recording stats.

 

[davidstarkey11]

Winter diesel.

The UK differentiates diesel fuel into Summer and Winter Fuel. Distribution of winter diesel in the UK starts in November and ends in March. Summer Diesel "waxes" at -5 whereas Winter Diesel "waxes" at -15. Winter Diesel has a different chemical composition to Summer Diesel, one difference being lower sulfur content. This can result in around 5% less energy, the lesser the energy the lower the MPG.