XJR 4.2 vs X250 XFS

XJR 4.2 vs X250 XFS

Author
Discussion

Samee

Original Poster:

24 posts

113 months

Tuesday 4th August 2020
quotequote all
I currently drive a Jaguar XF S 275 and whilst its a lovely car I cant help but think I'm missing out by not having an X350 XJR...
To all of you fellow phers who have owned an x350 xjr what mpg could I expect to get on a rather sedate motorway cruise with cruise control set to 65mph since at the moment I'm only getting 36mpg from my current jag diesel with cruise set to 70.
Are there any good indys in the north west andI know its a long shot but possibly east germany/austria/czechia since I spend quite a bit of time in those ends.
From what I have read the 4.2 v8s is quite reliable, but would you say its more reliable than the 3.0 diesel in the xf?
I currently own a 3.6 x350 sport with 60k on the clock (sorn) and that has achieved 29mpg at a steady 90mph on private roads, its had the air compressor rebuilt many times as well the bushes replaced, but other than that it has been reliable. Would I be wrong in thinking that an XJR would be any different?

blueacid

473 posts

146 months

Tuesday 4th August 2020
quotequote all
Samee said:
I currently drive a Jaguar XF S 275 and whilst its a lovely car I cant help but think I'm missing out by not having an X350 XJR...
To all of you fellow phers who have owned an x350 xjr what mpg could I expect to get on a rather sedate motorway cruise with cruise control set to 65mph since at the moment I'm only getting 36mpg from my current jag diesel with cruise set to 70.
Are there any good indys in the north west andI know its a long shot but possibly east germany/austria/czechia since I spend quite a bit of time in those ends.
From what I have read the 4.2 v8s is quite reliable, but would you say its more reliable than the 3.0 diesel in the xf?
I currently own a 3.6 x350 sport with 60k on the clock (sorn) and that has achieved 29mpg at a steady 90mph on private roads, its had the air compressor rebuilt many times as well the bushes replaced, but other than that it has been reliable. Would I be wrong in thinking that an XJR would be any different?
In terms of indies, I've had good service from Horner & Hudson in Macclesfield. They're a 10 minute stroll from the train station, so it's not too difficult to manage if you need to drop it off for a few days.

I'm also surprised by your low MPG, I've got a 2009 XF-S and with the cruise set to 70mph (so, GPS says 67mph or so), it'll quite happily do mid-40s, low-50s to the gallon. At least, it says it does, as soon as I typed that I now realised i've not worked it out with actual litres of fuel vs miles travelled!

Samee

Original Poster:

24 posts

113 months

Tuesday 4th August 2020
quotequote all
On a 360 mile round trip I only managed 36mpg with cruise set to 75mph.
I'm starting to think something might be wrong with it
All the more reason to start the search for an XJR...

Smoggy XJR

550 posts

75 months

Tuesday 4th August 2020
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"I ONLY managed 36mpg with cruise set to 75mph."

And you want an XJR?

Samee

Original Poster:

24 posts

113 months

Tuesday 4th August 2020
quotequote all
Well with a 3.0 diesel id expect more than 36mpg on a steady run whereas with a 4.2 supercharged V8 anything above 25mpg would be a plus.
Whenever I get the chance to drive my mothers XF 380 and do a motorway run I get over 30mpg and thats with it sitting at 90.
So if my diesel v6 is only getting 6 more mpg compared to a 380hp supercharged V6 I am going to be dissapointed

Smoggy XJR

550 posts

75 months

Wednesday 5th August 2020
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Fair enough. 25 mpg is about what I get, but that's an X300.

Smoggy XJR

550 posts

75 months

Wednesday 5th August 2020
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I just checked the "Honest John" real mpg page and that shows a claimed mpg of 37.6 and a real figure of 34.6. Yours doesn't appear too bad then.

TriumphStag3.0V8

4,002 posts

86 months

Thursday 6th August 2020
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I have a 2004 X350 Super V8 - which is basically an XJR with the sovereign interior, and a lot more toys.

On a run - I can hit 30-31mpg if I am cruising at 70mph on the motorway (that's indicated on the display). On a mixed journey with M/Way and NSL roads I get between 25mpg and 28mpg depending on how much overtaking is needed.

On my run to work, mix of 30mph limits and short NSL DC, I get between 15mpg-18mpg.

Engine is lovely, has a great grumble to it. If you already have an x350 - you will know all the pain points. The good news is that parts are not too expensive and the car is pretty easy to work on.
I have had to replace a couple of leaking coolant hoses, which were less than £20 each from the dealers (they have some weird auto-sealing connector on the end).

The one big problem is the supercharger coolant hose which sits in the valley of the V, its a cheap hose but a lot of labour to get to it.

The XJR is more sportingly aimed than the Super V8 - harder seats, plainer interior, less toys as standard, but it is a big, comfortable, fast car. DO IT!!!! Get one registered before 2006 so that it qualifies for the cheaper road tax!

Ian350

316 posts

183 months

Saturday 22nd August 2020
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I used to have a 2003 X350 XJR which I expected to keep for a couple of years just to scratch the itch but I kept it for 8 years as my daily driver. Cruising sedately on the motorway at 70 mph with no traffic jams would deliver 30 mpg according to the trip computer. Mixed commuting would be about 24 mpg in he rush hour. I used a north west Indy called Elite who also specialise in Range Rovers nowadays and I've always been pleased with them - located close to Parrs Wood & Didsbury in south Manchester.

fatboy b

9,563 posts

221 months

Saturday 22nd August 2020
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MPG concerns shouldn’t be high on the list when buying a supercharged V8!

John Locke

1,142 posts

57 months

Friday 28th August 2020
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^^^^^^^^^^^^
What he said, however, mine delivers 28 ish out of town (when driven legally), 23 ish overall, mid to high teens in heavy traffic. 2006 onwards cars have VVT, a few more bhp, and much better power delivery, but an extra fiver a week VED.