MPG - Heater on/off whats the difference?

andrew kennedy · Apr 7, 2012

I have a 2006 DT6 Sport. Can anyone explain what I could expect the increase in MPG to be if I were to not use the Heater/Ventilation system over say a journey of 100 miles of mixed urban/motorway use? and how exactly does using the Heater/Ventilation use more diesel. I will in the future be towing a light weight caravan if that makes any difference?

ricc · Apr 7, 2012

the heat from the heater is waste heat from the engine that would otherwise be dissipated to the outside air by the radiater behind thegrill at the front of the car....hence not using the interior heater causes the environment to warm up and ultimatly drowns polar bears , you are using electicityto run the fans for both heating and forced air ventilation which ultimatly comes from your diesel. if you consult your owners manual and google you canuse the wattage of the fan ,the calorific value of diesel and the conversion efficiency of your engine/generator/battery andcable losses to calculate the effect on mpg of running the fan..... or youcould install a solar panal to help chargethe battery so the engine doest have to.... which in theory could result is a fuel saving, terribly sorry you will have to do this research and calculations yourself cos i just dont have the time, even for such a worthwhile task.

if you have a family there is no such thing asa light weight caravan, by the time the missus has loaded all the toiletries essential for a night away and the kids have loaded their x boxes and play stations you will be approaching your legal max train weight. you will find this has a detremental effect on your nought to sixty times and youre mpg will plumet i suspect given the driving style appropriate to the intelligence of the question it may even reach single figures.

though ive out linned the theory of calculating effects on mpg i do feelt here are so many unknown variables that an empirical approach might be best.. ie suck it and see..

oxides · Apr 7, 2012

But the use of electricity by the heater fan will be offset by the saving of electricity from the radiator fan which will not have to work so hard!
In practice I think the additional fuel consumption of using heating and ventilation over a 100 mile run would be unmeasurable. AC is another matter, though.
But towing a caravan....... can you fit extra tanks in it?

ricc · Apr 7, 2012

in my limited experience the radiator fan is either belt driven, or leccy that never actually turns on

wiltshire landyman · Apr 7, 2012

i think someone has too much time on there hands to think up pointless qs

goonarmy · Apr 7, 2012

It dont matter.

easye1 · Apr 7, 2012

andrew kennedy said:
I have a 2006 DT6 Sport. Can anyone explain what I could expect the increase in MPG to be if I were to not use the Heater/Ventilation system over say a journey of 100 miles of mixed urban/motorway use? and how exactly does using the Heater/Ventilation use more diesel. I will in the future be towing a light weight caravan if that makes any difference?

Hmmmm,

I was told of an very rearly used fuel saving device,
one thats frowned upon by oil companies worldwide.

if you have a builders merchants near your abode,
go in and ask for 1 (single digit)
ordinary common building brick.
this needs to be placed between the foot operated vehicle motion pedal and the tripple layered sound deadning covering that emcompases the general floor areas under the above quoted foot operated motion pedal.

this causes a limited reaction of dynamic movement between the above quoted foot operated motion pedal,
and its maximun motional movement when depressed to its pre set makers requirements.

hence a more user friendly consumed fuel allowance per preplanned travel plan,
thus resulting in driving like a fanny for about 100 miles!

:crazy_driver:

TRXnMe · Apr 8, 2012

easye1 said:
Hmmmm,

I was told of an very rearly used fuel saving device,
one thats frowned upon by oil companies worldwide.

if you have a builders merchants near your abode,
go in and ask for 1 (single digit)
ordinary common building brick.
this needs to be placed between the foot operated vehicle motion pedal and the tripple layered sound deadning covering that emcompases the general floor areas under the above quoted foot operated motion pedal.

this causes a limited reaction of dynamic movement between the above quoted foot operated motion pedal,
and its maximun motional movement when depressed to its pre set makers requirements.

hence a more user friendly consumed fuel allowance per preplanned travel plan,
thus resulting in driving like a fanny for about 100 miles!

:crazy_driver:

Oh how things change over the years, when I were a lad the brick went on top of the peddle

owl · Apr 8, 2012

the engine fan is both belt driven and electric operated. Just turn the A/C off and drive as normal. if that's not enough get a smaller tow motor.

easye1 · Apr 8, 2012

TRXnMe said:
Oh how things change over the years, when I were a lad the brick went on top of the peddle

and used for parking motors with no wheels too.....lol

TRXnMe · Apr 8, 2012

easye1 said:
and used for parking motors with no wheels too.....lol

Handy if the handbrake was cr@p as well

The common house brick, more useful then the average swiss army knife

easye1 · Apr 8, 2012

TRXnMe said:
Handy if the handbrake was cr@p as well

The common house brick, more useful then the average swiss army knife

been told you can go shopping wiv `em too,

but never tried that,
I dont do much running...:rofl:

wiltshire landyman · Apr 9, 2012

TRXnMe said:
Handy if the handbrake was cr@p as well

The common house brick, more useful then the average swiss army knife

yep in this pic u can see said house brick acting as a hand brake

easye1 · Apr 9, 2012

wiltshire landyman said:
yep in this pic u can see said house brick acting as a hand brake

is that why so many fenders go missing in hilly places,
if some kid nicks the parking brick...

Dave90 · Apr 9, 2012

Being colder makes you thinner, so leave the heater off

Scott90 · Oct 27, 2012

I have the perfect solution if your worried about MPG don't buy a landrover buy a tdi Audi

Bix · Oct 27, 2012

To OP: If you're worried about how much fuel you'll burn by running heating/towing. You can't afford to run a Landy. Please return your keys to the nearest dealer and get something else. Such as a push bike.

TRXnMe said:
Handy if the handbrake was cr@p as well

The common house brick, more useful then the average swiss army knife

Apparently you can use them to build houses too.

Wiganerdan · Oct 28, 2012

bix said:
to op: If you're worried about how much fuel you'll burn by running heating/towing. You can't afford to run a landy. Please return your keys to the nearest dealer and get something else. Such as a push bike.

+1

Paul D · Oct 28, 2012

andrew kennedy said:
I have a 2006 DT6 Sport. Can anyone explain what I could expect the increase in MPG to be if I were to not use the Heater/Ventilation system over say a journey of 100 miles of mixed urban/motorway use? and how exactly does using the Heater/Ventilation use more diesel. I will in the future be towing a light weight caravan if that makes any difference?

Somewhere between **** loads and feck knows.

To be anally concerned about the mpg effect, of having a car heater on has, means you really will NOT like any Landrover.

Get a feckin' Prius.

No don't, get a bus.

DEFENDER90-DAZ · Oct 28, 2012

Fishsponge???

Daz

MPG - Heater on/off whats the difference?

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