2.5 diesel MPG

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newcyboots

newcyboots

New Member
Posts
240
Location
In a ditch, or any jet wash in south wales......
Hi guys,

About to take the P38 plunge - youve all been great so far with advice in my previous post.

Could all you diesel owners out there post on this thread letting me know about your average MPG?

Before anyone starts, i know its going to be ****.. and i accept that.. But i want a RR so dont care..

However, diesel is shocking at the moment. I have test driven 5 P38s now, all autos and the message centre displays averages form 23.9 (lowest) to 30.3 (highest)
Trouble is, since all of these cars are in garages i dont know what kind of trips the RR's were doing before to achieve those figures.

On the last one i reset the computer, test drove it for about 45 minuites doing a total of 30 miles on motorway, a roads, b roads and city centre and averaged 27.1.. Is this about right?

i want an auto, but if theres a big improvement on MPG i MAY try and get a manual..

Please feel free to let me know what you guys get out of your 2.5 RR's.

My daily commute to work is 17 miles, 3 country lanes, 11 of dual carridgeway the 3 miles on the M4.
 
Mines auto and the long term average based on brim to brim figures is 24mpg. I have had up to 30 mpg on a run taking it easy. Pretty good for a 2 tonne plus car IMO.
 
Around London - 14 mpg. Trips 1 to 14 miles.
Motorways - 28 ish - might get over 30 if stayed withing limit
Best over a period of time - 29.4 in France. Mix of national routes and toll roads. I'm convinced it would have done better than 30 if Mrs G~ hadn't insisted in there being a Lake Titticaca of bottled water in the back.

I should think that you'll get 24 ota on the usage that you suggest.

G~
 
I reckon I'm getting 28 - 30 mpg with the manual box. I have to say I'm very impressed considering it has the aerodynamics of a brick and 20 year old diesel technology.

Look at biodiesel options. I'd be cautious of straight-vegetable oil but you might decide to take a risk, or mix 50/50 in the summer.
 
Mine is a manual, averages 25mpg mainly A/B road driving usually with a bit of towing thrown in, will do high 20s on a run, never quite made it to 30mpg....

I am firmly of the opinion having seen other similar threads on here that the fuel saving from choosing a manual is negligible

HTH

Cheers

Jerry
 
Grrrrrr said:
I reckon I'm getting 28 - 30 mpg with the manual box. I have to say I'm very impressed considering it has the aerodynamics of a brick and 20 year old diesel technology.

Look at biodiesel options. I'd be cautious of straight-vegetable oil but you might decide to take a risk, or mix 50/50 in the summer.
Click to expand...

I'm sure your figure is from the message centre and probably not accurate;)
 
Grrrrrr said:
considering it has the aerodynamics of a brick and 20 year old diesel technology.
Click to expand...

It has a cd of 0.38, hardly brick-like and only matched today by things such as a Tiguan and Kuga etc. For comparison the RRC had a cd of 0.45.

And the diesel engine while outclassed now was cutting edge technology 20 years ago, probably the most advanced indirect injection engine out there.

It still has certain advantages over the new common rail diesels, its much more accomodating of low quality fuel for one.

Watch this space as fuel prices go through the roof and more and more dodgy diesel makes its way into the marketplaces, there will be BMW 520D's croaking it all over the place. Not much good boasting about 50mpg when you're in the garage for £1000's worth of new injectors because you filled up with crap diesel. Its becoming a common occurance over here with washed diesel from the border.
 
Last edited:
Would get 18 mpg on manual driving around the countryside mostly with trailers, 30 on the motorway. It has a blue tuning power box.

Recently switched to using biodiesel that I run my 300 tdi discovery on and get about 22 doing the same trips around the countryside. Yet to do a motorway trip on it.

For those who may ask. Gone through 6 tanks of bio with no negative effects but more power
 
Grrrrrr said:
:)

Mix of A roads and motorways but I must admit never accelerating hard and just tootling along. Calculated taking measurements from fuel receipt and distance from trip computer. Like I say, I'm impressed.
Click to expand...

Tyres make a lot of difference though. Oil probably, too. Starting and stopping a killer. So many variables!
 
Daily Drive to work:

7 miles on Country Roads
2 miles on an A road
8 miles on the M25
3 Miles on the Airport Perimeter Road

Averaged 25.2mpg from my previous '99 DSE using brim to brim method - onboard trip computer MPG is optimistic!!
 
There's a local guy to me who sells it. Its difficult to find most of the time as there's no definitive list of pumps etc. so it's often local knowledge.

But make sure it's good stuff he sells as you can get some crap, but they won't last long if they are. But read up on that website and it will tell you everything you need to know!
 
SpudH said:
It has a cd of 0.38, hardly brick-like and only matched today by things such as a Tiguan and Kuga etc. For comparison the RRC had a cd of 0.45.

And the diesel engine while outclassed now was cutting edge technology 20 years ago, probably the most advanced indirect injection engine out there.

It still has certain advantages over the new common rail diesels, its much more accomodating of low quality fuel for one.

Watch this space as fuel prices go through the roof and more and more dodgy diesel makes its way into the marketplaces, there will be BMW 520D's croaking it all over the place. Not much good boasting about 50mpg when you're in the garage for £1000's worth of new injectors because you filled up with crap diesel. Its becoming a common occurance over here with washed diesel from the border.
Click to expand...

CD is a calculation based on drag related to frontal area. It's actually pretty meaningless but was good for the sales propaganda. The frontal area of a P38 is much like a barn door in area no matter that it's a barn door with smooth edges:)
 
Almost all the time 24 mpg (mix of short (10km) and long (100km) runs). best was 27 mpg (5 people, a dog, full of luggage, B roads through Bosnia). All brim to brim measurements.
 
newcyboots said:
Hi guys,

About to take the P38 plunge - youve all been great so far with advice in my previous post.

Could all you diesel owners out there post on this thread letting me know about your average MPG?

Before anyone starts, i know its going to be ****.. and i accept that.. But i want a RR so dont care..

However, diesel is shocking at the moment. I have test driven 5 P38s now, all autos and the message centre displays averages form 23.9 (lowest) to 30.3 (highest)
Trouble is, since all of these cars are in garages i dont know what kind of trips the RR's were doing before to achieve those figures.

On the last one i reset the computer, test drove it for about 45 minuites doing a total of 30 miles on motorway, a roads, b roads and city centre and averaged 27.1.. Is this about right?

i want an auto, but if theres a big improvement on MPG i MAY try and get a manual..

Please feel free to let me know what you guys get out of your 2.5 RR's.

My daily commute to work is 17 miles, 3 country lanes, 11 of dual carridgeway the 3 miles on the M4.
Click to expand...

Yup. Those figures are about right in my opinion. Mine did 22ish around town and averaged 28 on a long trip to Cornwall, fully loaded with family, stuff for hols and the air con on all the time.

The best I got was about 30 on my own at a steady 70mph on the M1
 
Gonna be the first of the LPG boys to chip in. Currently paying 67.9p for LPG, Diesel at the same garage has just hit 139.9p. I average 12mpg around town and about 17mpg on a run. The change over from petrol is within half a mile from cold and will start on gas until started again from stone cold, so petrol use is minimal.

I think that makes running costs now comparable to the diesel. Throw in V8 acceleration and exhaust note and everyone's a winner:)

And before the glass is half empty guys and girls chime in with horror stories of running too hot and mobile bombs waiting to explode I run 3 LPG vehicles (2 Rangies and a Transit) which have covered over 70k miles between them in my ownership and none of them have missed a beat. Extra servicing includes a few filters and tuning with the software, both as cheap as chips.
 
fortgrange said:
Gonna be the first of the LPG boys to chip in. Currently paying 67.9p for LPG, Diesel at the same garage has just hit 139.9p. I average 12mpg around town and about 17mpg on a run. The change over from petrol is within half a mile from cold and will start on gas until started again from stone cold, so petrol use is minimal.

I think that makes running costs now comparable to the diesel. Throw in V8 acceleration and exhaust note and everyone's a winner:)

And before the glass is half empty guys and girls chime in with horror stories of running too hot and mobile bombs waiting to explode I run 3 LPG vehicles (2 Rangies and a Transit) which have covered over 70k miles between them in my ownership and none of them have missed a beat. Extra servicing includes a few filters and tuning with the software, both as cheap as chips.
Click to expand...

Don't forget the HGF and slipped liners, camshaft failures not to mention no spare wheel. And when the next serious fuel crisis comes you can't run it on used veggie oil.
 
lpg v8 pain in the arse i know had one! trying to work out where lpg outlets are whenever going farther afield!
and if we are talking alternate fuels then i buy my bio diesel for 80p a litre ( the reason why i stopped making it) and get around 26mpg calculated not trip computer she is chipped.
so someone else can do the math 26mpg at 80p a litre!
also when i cant get bio i buy 10 ltrs of sunflower oil from tesco for £10 so pound a litre.
the m51 engine will run quite happily on cooking oil but the intank fuel pump wont take it for very long, hence the reason why mine has a facet cube electric pump under the bonnet instead of the crap and rather unreliable intank pump!
 
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