Whats the true mpg you are getting on v40 d2 1.6 diesel? - Page 3 - Volvo V40 Forums
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post #21 of 238 (permalink) Old 06-12-2014, 10:55 PM
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Good tip. I will check the pressures tomorrow.
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post #22 of 238 (permalink) Old 06-12-2014, 10:58 PM
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Tyres must be ambient temperature mind! :-)
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post #23 of 238 (permalink) Old 06-12-2014, 11:01 PM
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Tyres must be ambient temperature mind! :-)
Advice appreciated.
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post #24 of 238 (permalink) Old 07-12-2014, 07:28 PM
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Seriously, I get around 800 miles on a full tank of diesel. MPG is in the high 70's.
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post #25 of 238 (permalink) Old 07-12-2014, 10:08 PM
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Since the weather has cooled- the average MPG of my T3 has dropped slightly from 47.8 to 46.5.
Still really pleased with that from a 150 brake petrol

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post #26 of 238 (permalink) Old 07-12-2014, 11:27 PM
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Since the weather has cooled- the average MPG of my T3 has dropped slightly from 47.8 to 46.5.
Still really pleased with that from a 150 brake petrol
The original poster is querying the 1.6 D2 in this thread Darren.
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post #27 of 238 (permalink) Old 08-12-2014, 10:06 AM
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Since the weather has cooled- the average MPG of my T3 has dropped slightly from 47.8 to 46.5.
Still really pleased with that from a 150 brake petrol
Interesting, I assumed MPG went up with colder air - as the air is more dense and cooler giving more power which (if you don't use it) turns into more economical driving as you have to put your foot down slightly less. Please can someone correct me if I'm wrong.
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post #28 of 238 (permalink) Old 08-12-2014, 11:08 AM
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I can only get 28 mpg in my D2. The dpf is causing problems and the turbo is shot.
I can only just squeeze 28mpg out of mine on a really good day and there's absolutely nothing wrong with it!

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post #29 of 238 (permalink) Old 08-12-2014, 11:10 AM
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Interesting, I assumed MPG went up with colder air - as the air is more dense and cooler giving more power which (if you don't use it) turns into more economical driving as you have to put your foot down slightly less. Please can someone correct me if I'm wrong.
Car has to run richer for much longer while it warms up. Over an incredibly long journey you might be right, the more efficient burn once up to temperature might cancel out the additional fuel used to warm up.

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post #30 of 238 (permalink) Old 08-12-2014, 12:31 PM
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Originally Posted by MJW75 View Post
Interesting, I assumed MPG went up with colder air - as the air is more dense and cooler giving more power which (if you don't use it) turns into more economical driving as you have to put your foot down slightly less. Please can someone correct me if I'm wrong.
You are correct, in that a fully warm engine will run more economical in a cold climate than a fully warm engine in a hot climate, due to the higher density of the air (more oxygen content). This is reduced though as you already have an intercooler to drop the post turbo temp of the air. More dense air will mean more drag on body (minute).

This advantage is significantly outweighed by a very badly fitting and uneconomical cold engine, which does not run efficiently till fully warm. There will be point that a summer mile will equal a winter mile but I would think it will be a +50 mile trip before things balance out - without doing the maths.

So winter consumption is usually always higher (but loss will diminish the further you drive), you do not benefit from the tyres getting harder as they warm either; also drag on all transmission oils etc is far more when they are cold as their viscosity is far higher.

You also can get fuel shrinkage in winter (although car may have fuel pre heater - some do)!

Have put elsewhere but for the trips I do, I usually expect a 20% drop in winter economy vs summer economy in the UK

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