What could be the cause of declining MPG
Discussion
Hello Everyone
I have a 2.5 V6 tdi on a 53 plate.
I used to be able to manage just about 40mpg on average on my commute (A road + motorway) but in the last couple of months the economy has slowly declined to a now indicated 36mpg.
The car has been serviced on the 21st of December. I have check the obvious, tyres, oil and clean the MAF.
Can the bad weather drop the economy by 4MPG?
What could the cause MPG to drop so much? (haven't changed my driving style)
Kind regards
Jack
I have a 2.5 V6 tdi on a 53 plate.
I used to be able to manage just about 40mpg on average on my commute (A road + motorway) but in the last couple of months the economy has slowly declined to a now indicated 36mpg.
The car has been serviced on the 21st of December. I have check the obvious, tyres, oil and clean the MAF.
Can the bad weather drop the economy by 4MPG?
What could the cause MPG to drop so much? (haven't changed my driving style)
Kind regards
Jack
Jack_and_MLE said:
Hello Everyone
I have a 2.5 V6 tdi on a 53 plate.
I used to be able to manage just about 40mpg on average on my commute (A road + motorway) but in the last couple of months the economy has slowly declined to a now indicated 36mpg.
The car has been serviced on the 21st of December. I have check the obvious, tyres, oil and clean the MAF.
Can the bad weather drop the economy by 4MPG?
What could the cause MPG to drop so much? (haven't changed my driving style)
Kind regards
Jack
Could just be the fuel, not all fuels are the same - Winter diesel has additives in it to stop it freezing. I have a 2.5 V6 tdi on a 53 plate.
I used to be able to manage just about 40mpg on average on my commute (A road + motorway) but in the last couple of months the economy has slowly declined to a now indicated 36mpg.
The car has been serviced on the 21st of December. I have check the obvious, tyres, oil and clean the MAF.
Can the bad weather drop the economy by 4MPG?
What could the cause MPG to drop so much? (haven't changed my driving style)
Kind regards
Jack
Recently did a trip up to Scotland over Xmas. Filled up with Shell Diesel in Surrey & chugged up the M'way doing around 45Mpg (about 420 miles).
Refilled it at Sainsburys in Stirling & headed up the A9 & the thing was barely doing 37mpg.
Chewed through that tank of fuel in less than 350 miles & refilled with BP diesel somewhere round Carlisle on the way back south & back to averaging 45mpg ish.
Dead right, its the conditions. The low temp can cause a drop of 5mpg.
Its all down to the increased friction in the car. Oil in the engine and gearbox stays thicker longer, as does the grease in your wheelbearing etc.
It will improve with the weather.
Rob
Its all down to the increased friction in the car. Oil in the engine and gearbox stays thicker longer, as does the grease in your wheelbearing etc.
It will improve with the weather.
Rob
Edited by Relaxitscool on Tuesday 12th January 19:39
JuniorD said:
My daily driver has same engine as op and the fuel consuption has plummeted lately. The cold and being stuck in more traffic is causing a hit. I'm down about 7-8mpg on like-for-like journeys.
I'm down about 5mpg in a 3.0tdi. Just in the cold weather.Still, might reach a balmy 4c here at the weekend. BBQ time...
Also, check the tracking.
A number of years ago I took my Audi to France, I always used to see 40mpg on the trip computer as average. However, on leaving the ferry in St Malo the mpg climbed to 45 over the next few miles. It remained above 45 sometimes hitting 50 throughout the stay in France, despite the additional luggage and family being lugged around. Coming home the opposite happened, left the ferry in Portsmouth and the mpg dropped down to 40 on the way home. It wasn't traffic by the way as we arrived home at 2 in the morning and the roads were at least as clear as France.
Another instance was with my X Type. I had an estate and my father had a saloon at the time. Again in Frnce on holiday, and this time following my father, he was averaging 47-50mpg, I was doing 42-45. As I was following him it certainly wasn't due to speed differential.
A number of years ago I took my Audi to France, I always used to see 40mpg on the trip computer as average. However, on leaving the ferry in St Malo the mpg climbed to 45 over the next few miles. It remained above 45 sometimes hitting 50 throughout the stay in France, despite the additional luggage and family being lugged around. Coming home the opposite happened, left the ferry in Portsmouth and the mpg dropped down to 40 on the way home. It wasn't traffic by the way as we arrived home at 2 in the morning and the roads were at least as clear as France.
Another instance was with my X Type. I had an estate and my father had a saloon at the time. Again in Frnce on holiday, and this time following my father, he was averaging 47-50mpg, I was doing 42-45. As I was following him it certainly wasn't due to speed differential.
MKnight702 said:
Also, check the tracking.
A number of years ago I took my Audi to France, I always used to see 40mpg on the trip computer as average. However, on leaving the ferry in St Malo the mpg climbed to 45 over the next few miles. It remained above 45 sometimes hitting 50 throughout the stay in France, despite the additional luggage and family being lugged around. Coming home the opposite happened, left the ferry in Portsmouth and the mpg dropped down to 40 on the way home. It wasn't traffic by the way as we arrived home at 2 in the morning and the roads were at least as clear as France.
Another instance was with my X Type. I had an estate and my father had a saloon at the time. Again in Frnce on holiday, and this time following my father, he was averaging 47-50mpg, I was doing 42-45. As I was following him it certainly wasn't due to speed differential.
road surface with less rolling resistance? or just flatter?A number of years ago I took my Audi to France, I always used to see 40mpg on the trip computer as average. However, on leaving the ferry in St Malo the mpg climbed to 45 over the next few miles. It remained above 45 sometimes hitting 50 throughout the stay in France, despite the additional luggage and family being lugged around. Coming home the opposite happened, left the ferry in Portsmouth and the mpg dropped down to 40 on the way home. It wasn't traffic by the way as we arrived home at 2 in the morning and the roads were at least as clear as France.
Another instance was with my X Type. I had an estate and my father had a saloon at the time. Again in Frnce on holiday, and this time following my father, he was averaging 47-50mpg, I was doing 42-45. As I was following him it certainly wasn't due to speed differential.
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