Fuel consumption

Peugeot 406 HDI 1.9, 90bhp, 2002.

I get about 33 mpg to/from work, town driving. I thought the mileage
would be higher - what consumption figures do the rest of you get for
this type of car? Is there anything wrong with mine?

Neil.

 

I get that towing a caravan with a Xantia (same engine).
Have power boosted it by Eastcoast Racing and it still returns 48mpg on a
run and 44 on mainly town work.
Depends what distances you're driving, sitting in traffic jams or running
with gentle throttle.
All filters clean and correct oil changed as per book?
Dave.

 

I used to get 40mpg winter 43mpg summer out of mine Town work or motorway
didn't make any difference.

ogglet

 

Are you sure you are doing your sums right? If so, check for binding
brakes, fuel leaks etc. That does seem awfully low. A mate of mine has one
and claims to do @ 50 mpg on mixed motorway/town driving.

 

I have averaged to press 50.4 mph over 17904 miles and I count it hard
driving taxi kids to school on contract, 2002 406 estate 90 engine oil
change every eight thou, service after two oil changes

Malc

 

It very much depends on the distance. They are very heavy on fuel for the
first couple of miles, so if this is the sort of journey you commonly make,
it might explain.
Try it on a long run.

 

Not done any sums - I'm going by the computer readout. (I can guess the
response I'm going to get!!)

Neil.

 

Well, you could always do the brim the tank, zero the trip mileage, fill up
the nearly empty tank and DO SOME SUMS !!!!!
Just to confirm the computer is correct.

 

I find the computer readout fairly useless. What I particularly like, is
when I fill up, only about half a mile from home usually, the readout tells
me that I can do about 480 miles until the next refuel. A hundred miles
later (in one journey) and it tells me that I can now do 520 miles.....
I just wish it would carry on like that - the further you travel, the longer
it will be until you have to refuel.

Oh, and I do know why, before 25 people explain.

What it does show is that if you continually only do short journeys, then
you will use a lot of fuel.

 

Round about the same from my 307 2.0HDi (110bhp) on stop-start
commuting into and site visits around Manchester.

Yes, it's a Peugeot.

 

In message <gpUBf.110117$>

I was once picked up in one of those which was used as a taxi. I got
into discussing fuel consumption with the driver, comparing it with my
407 (the driver was thinking of replacing his car with a 407). He was
getting a pretty steady 47mpg, but as an airport taxi it was mostly
used on motorways. I did notice that he drove at a steady 70mph all
the time though.

But I think the 407 9which I have with the 136bhp version is much the
same. With a cold engine the fuel consumption is very high, so with a
lot of short journeys it does badly. But if I drive at a steady 50mph
in 6th gear, I can get spectacularly good mileage. I once saw 117mpg
over 4 miles through motorway roadworks (but it was slightly downhill
most of the way). 30MPG would be more typical with short journeys
around town.

Martin

 

But diesel engine economy isn't affected by engine temperature - unlike
petrol engines, they don't use more fuel when cold.

 

In message <>

Well, that certainly isn't my experience. It's true that I don't
suffer the loss of power with a cold engine that happens with petrol
engines, but when you think about it, the energy to heat up the engine
block, oil and coolant to working temperature must come from burning
fuel, even with a diesel.

I would also suggest that diesel engines take longer to fully warm up,
but they drive just a well when cold.

Martin

 

But if this is waste heat that won't matter.

On many diesels there's simply more to heat up - heavier block, bigger
engine for the size of car, etc.

 

The reason a diesel takes longer to warm up is that they are are much more
efficient than petrol and therefore less fuel burnt means less thermo
dynamic heat being produced.
Petrol in a cold engine is at a much higher ratio than when its at normal
running temperature therefore more fuel in more heat out... simple physics
really


Rob J

Rob J


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Well, that's how it is

I imagine that your journeys with a cold engine, are fairly short stop-start
trips through town or whatever. It's this continuous accelerating and
braking that ruins your economy - if you took your car for a trip up the
motorway, you'd find it consumed almost exactly the same amount of fuel
whether the engine was hot or cold.

Ah, but that exact same heat is still being produced once your engine is
warm ! The "heating power" is always being used - it doesn't just cease once
the engine is warm

That's because they're more efficient than Petrol engines.