Drove a Jaguar XF Diesel S and got 13mpg ???
Discussion
but it was a Renault magnumschmalex said:
tim2100 said:
My father has one and gets average of 27mpg over the last 10k miles.
He has a reasonably heavy right foot and does not drive to save fuel.
Jesus. That's appalling!!!! I have averaged 26mpg over the last 30,000 miles in my car, which has a 5.0L V8 petrol engine. I certainly don't drive to save fuel. He has a reasonably heavy right foot and does not drive to save fuel.
What's the point in paying 5 / 6p per litre more for diesel if you can get as near as dammit the same mpg out of a big old petrol lump?!?!??!?
You don't buy a 3.0 Twin Turbo diesel to get 40+ mpg
A few simple checks are required here.
Firstly is there evidence on your drive of diesel spill. It could be a leaking hose from the fuel filler to the fuel tank chaffing. This happened on my BMW so that was fixed on warranty.
Next flat bit of road reset the trip computer and hold the speed at 60mph in 6th gear for a mile or two. You should easily see into the 60's mpg.
Next how much black smoke is coming out under full load? If it's terrible it's a clogged injector or more than one basically rather than a fine mist of fuel into the combustion chamber it's a big drip so doesn't produce the powwer it should hence using a lot more fuel than it should.
Fuel filter leaking again check drive for evidence.
Really as it's an auto on give and take roads you should be seeing just into the low 40's and on m way higher 40's.
Post up after these tests so we can determine the real problem and resolve it for you.
Firstly is there evidence on your drive of diesel spill. It could be a leaking hose from the fuel filler to the fuel tank chaffing. This happened on my BMW so that was fixed on warranty.
Next flat bit of road reset the trip computer and hold the speed at 60mph in 6th gear for a mile or two. You should easily see into the 60's mpg.
Next how much black smoke is coming out under full load? If it's terrible it's a clogged injector or more than one basically rather than a fine mist of fuel into the combustion chamber it's a big drip so doesn't produce the powwer it should hence using a lot more fuel than it should.
Fuel filter leaking again check drive for evidence.
Really as it's an auto on give and take roads you should be seeing just into the low 40's and on m way higher 40's.
Post up after these tests so we can determine the real problem and resolve it for you.
TRUENOSAM said:
bunyarra said:
tim2100 said:
You don't buy a 3.0 Twin Turbo diesel to get 40+ mpg
If I drive sensibly (boringly), can get 43+ mpg on a motorway/A road run in the XF 3.0D.The tank was full at the start of this drive, but I guess cruising at 150mph for 80 miles will do that!
Here was a quick banzai down the autobahn the next day, trouble is, people keep sodding pulling out in front of you! Inconsiderate barstewards!
http://www.youtube.com/watch?v=EahgRfbJEJM&fea...
Edited by zx10ben on Saturday 1st January 23:31
TRUENOSAM said:
bunyarra said:
tim2100 said:
You don't buy a 3.0 Twin Turbo diesel to get 40+ mpg
If I drive sensibly (boringly), can get 43+ mpg on a motorway/A road run in the XF 3.0D.Not everybody aspires to get 6000000mpg. For some as long as the consumption is agreeable to their usage, then its ideal.
For my father getting 27mpg is fantastic. He is more than happy with that.
I struggle to get 35mpg out of a 2.0 Diesel mazda6.
Besides, If your driving is long distances or motorway use then 40mpg would be required, that cannot be expected when commuting in & out of a city centre then 25-30 is more reasonable.
Noone is debating if someone is happy or not with 27mpg but 9mpg there us a fault with the car ie it's most likely leaking fuel in which case totally wasting money for zero enjoyment.
I honestly wonder if you drive the xf in 3rd gear at 70 mph you would still be in the mid 20's and that would be near max rpm as such something is wrong.
Being stationary in traffic wouldn't do it. In the snow 2009 I spent 10 hours static engine running in the Volvo which usually returned 32mpg. On that tank it dropped to only 27 mpg which was a surprise as such 9mpg has nothing to do with that as diesel would be more efficient and I doubt he has been sitting static fr 24 hrs engine running
op please post up no response to these questions seem very odd and highlight what I believe this make up thread is all about diesel bashing to counter the fuel price rise where economy is more and more important.
I honestly wonder if you drive the xf in 3rd gear at 70 mph you would still be in the mid 20's and that would be near max rpm as such something is wrong.
Being stationary in traffic wouldn't do it. In the snow 2009 I spent 10 hours static engine running in the Volvo which usually returned 32mpg. On that tank it dropped to only 27 mpg which was a surprise as such 9mpg has nothing to do with that as diesel would be more efficient and I doubt he has been sitting static fr 24 hrs engine running
op please post up no response to these questions seem very odd and highlight what I believe this make up thread is all about diesel bashing to counter the fuel price rise where economy is more and more important.
Maybe there is/was a mechanical fault with the car, yes. Alternatively there could also be something wrong with the driving style. If too much speed is scrubbed off before entering the corner, then lots of fuel will be needed to bring the vehicle back up to its previous mph.
Momenum is key, not just for lap times but for fuel conservation too.
Momenum is key, not just for lap times but for fuel conservation too.
finlo said:
Legacywr said:
finlo said:
Managed to get 6mpg on the fuel computer of a brand new 1.6 MG Maestro (the one with the twin Webbers)
Weren't they fuel injected?Not the early one's.
Lordglenmorangie said:
A question for all you Golf tdi chaps, I bought a tdi 130 GT and when I first got it was averaging 54 to the gallon this has dropped to 38/40 I do a lot of short runs 5/10 miles this plus cold weather, is this the reason for the drop. Mind you not complaining, love the torque 
I have a 09 TDI (130 or somewhere around that number) and my MPG always drops in bad weather although on a bad day I see 42-45 out of it but again depends on traffic conditions and how long it runs for.I'd say for short journeys before it's warmed in bad weather that figure probably isn't too far out.
GKP said:
Maybe there is/was a mechanical fault with the car, yes. Alternatively there could also be something wrong with the driving style. If too much speed is scrubbed off before entering the corner, then lots of fuel will be needed to bring the vehicle back up to its previous mph.
Momenum is key, not just for lap times but for fuel conservation too.
it's an auto and even driving at full rpm constantly at 70mph in 3rd wouldn't get close to this mpg your scenario above would be notably better mpg than full revs constantly. Momenum is key, not just for lap times but for fuel conservation too.
I had a merc cls 3.2tdi as a hire car for a week. I drove it like I stole it mpg 28. Then I did the same trips normal driving 34-36mpg. And yes I put it in manual mode to hold revs at full in 3rd at 70mph and it was low to mid 20's.
If a cars combined mpg is 36mpg and urban is 30mpg 9mpg for a tank on the public highway just cannot happen in that car with that engine. As I said 10hrs stationary engine running it decreased my petrol tank mpg by 5mpg. So unless nearly the entire tank was run stationary then there is a problem
I clear the trip every refil and leave the display on tank average simply driving at walking pace from the pump to the main road I get well over 9mpg 3ltr tdi auto and within half a mile the trip is showing mid to high 20's. By the time I
at a mile it's returning mid 30's.
Ordinary_Chap said:
Lordglenmorangie said:
A question for all you Golf tdi chaps, I bought a tdi 130 GT and when I first got it was averaging 54 to the gallon this has dropped to 38/40 I do a lot of short runs 5/10 miles this plus cold weather, is this the reason for the drop. Mind you not complaining, love the torque
I have a 09 TDI (130 or somewhere around that number) and my MPG always drops in bad weather although on a bad day I see 42-45 out of it but again depends on traffic conditions and how long it runs for.I'd say for short journeys before it's warmed in bad weather that figure probably isn't too far out.
culpano said:
Drove it on a 20 mins run, mixed twisty road, motorway and town driving.
Ok I did floor it a couple of times but 13mpg ????
Which is exactly why you cant take one run and assume its typical.Ok I did floor it a couple of times but 13mpg ????
When i got my last 535d i got 9mpg on its first run.
Overall i was getting 34mpg on subsequent use.
daemon said:
culpano said:
Drove it on a 20 mins run, mixed twisty road, motorway and town driving.
Ok I did floor it a couple of times but 13mpg ????
Which is exactly why you cant take one run and assume its typical.Ok I did floor it a couple of times but 13mpg ????
When i got my last 535d i got 9mpg on its first run.
Overall i was getting 34mpg on subsequent use.
Welshbeef said:
daemon said:
culpano said:
Drove it on a 20 mins run, mixed twisty road, motorway and town driving.
Ok I did floor it a couple of times but 13mpg ????
Which is exactly why you cant take one run and assume its typical.Ok I did floor it a couple of times but 13mpg ????
When i got my last 535d i got 9mpg on its first run.
Overall i was getting 34mpg on subsequent use.
Edited by daemon on Sunday 2nd January 21:03
Lordglenmorangie said:
A question for all you Golf tdi chaps, I bought a tdi 130 GT and when I first got it was averaging 54 to the gallon this has dropped to 38/40 I do a lot of short runs 5/10 miles this plus cold weather, is this the reason for the drop. Mind you not complaining, love the torque
Will it have an auxiliary heater to get the engine up to temperature quicker? This would also use diesel, and if you're constantly driving 5/10 miles from cold you're probably running the heater a fair proportion of the time in this weather.Gassing Station | General Gassing | Top of Page | What's New | My Stuff