Hi all I have a 2007 VRS petrol ,lately I have been getting a drop off in my fuel consumption by about 6MPG differance than a week ago,

It might be just me but it feels like its a little laggie in boost ,when I first got the car the revs seem to dip when pulling away in first I thought it was just me getting used to a new car now i think it might be a flat spot,as i have to almost slip the clutch a bit when pulling away the car is due a service not quite sure on which way to go with this anyone got any suggestions??

What sort of journeys do you do? I only do short (5-10 mile) runs and once the cold weather sets in I see the MPG drop quite a bit too (4-5 ish MPG).

What sort of journeys do you do? I only do short (5-10 mile) runs and once the cold weather sets in I see the MPG drop quite a bit too (4-5 ish MPG).

I usually do 70 miles motorway driving I always drive the same 2 and from work

I usually do 70 miles motorway driving I always drive the same 2 and from work

I thought the MPG would increase with the cold weather as turbos work better when the air is dense and cold??

But the engine takes longer to reach operating temperature when it's cold so MPG tends to drop in the colder months during shorter journey's.

Its not as bad as diesels, Petrol's like it cooler yes Diesel's love running really hot.

My 10 mile commute consumption goes from 38-40 in the summer to 32-35 Mpg in the colder weather. Perhaps it's the same for the OP even though the journey is longish motorway run.

lots of factors affect the mpg when it gets colder. cold temperatures drop the tyre pressures increasing the rolling resistance of the tyres this can alone be good for 1=2 mpg also as the colder season approaches the oil companys put in extra butane for better winter running( better starting tickover when cold etc), this affects the mpg adverserly, unfortunatley the petrol suppliers dont tell you that there will be a change in fuel economy (for obvious reasons) ,you dont notice a change in running charecteristics so much whem warm .its cold running more that little oddities appear such as poor pick up and hesitancy only the drop in mpg is glaringly obvious!! !subtle but annoying

Just been watching my fuel gauge going down 128m for the first quarter,temp outside -1 normally 190 to 200m, its due a service and all levels are correct, I have been sitting with it idling away to keep warm so that might be part of the cause, dont know if the winter tyres are affecting it also

On old petrol cars thee was a leaver on the air intake ducting that you could close it off in winter is there anything like that on the diesels

Edited 7 November, 201114 yr by skippy41

as previously posted above you will most definately notice a drop in economy now as the fuel suppliers introduce the "winter blend" of diesel its different from what you recieve in the summer period ,this is widely publicised and accepted in northern europe and even our teutonic chums the germans use it as soon as its getting cooler but as normal here in the uk we are told nothing and expected to just get on with it ,on the plus side if we are to get any more of the nasty icy white stuff we got last year you really do want the winter blend as "normal diesel would suffer heavily from "waxing" at the lower temperatures .( a guy at work who was fixing our fiat vans as the gearbox oil that was filled in sunny italy became porridge at minus 16 and rendered them useless, mentioned that the supermarket fuels were giving owners grief at minus 18 and it was at the fuel filter every time where the thickened "waxed" fuel had clogged the filter and stopped the engine ).Imagine that scenario on a blocked motorway or in the middle of nowhere and your only source of heat is if the engines going to keep running!