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Thread: Help me persuade my wife we need a 4.2

  1. #1
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    Help me persuade my wife we need a 4.2

    After a short break away from the S Type it's time we bought another one. We traded the last one in for a Porsche Boxster S. We've had two 3.0 SE cars previously but I'm really tempted by a 4.2

    Well, it's a thing, isn't it? A 4.2 litre Jag? Got to be done.

    Unfortunately, as reasonable as that argument obviously is my wife doesn't agree and keeps on bleating on about fuel consumption.

    Now, I don't think there's as much difference in average MPG between the 3 and the 4.2 as she thinks. My theory is that the 3 litre would have to have more throttle input to achieve the same speed as the 4.2 would have to do so would use more fuel. (She doesn't accept that argument either)

    I'm guessing there are plenty of people on here who have owned both so please can anyone tell me, is the 4.2 significantly more thirsty in normal driving (i.e. not particularly lead footed but enjoyed on occasion) than the 3?

    Obviously if I was to drive it like I stole it everywhere the 4.2 would be thirstier but what's it like to live with economy wise on a normal day?
    Currently between Jags.
    Daily driver: 1993 Eunos Roadster
    Weekend car: Porsche 986 Boxster S (Up for sale. Anyone interested?)
    "Practical" car: Fiesta ST150

  2. #2
    Senior Member Andy K's Avatar
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    I'm sure a 3 litre is plenty to move an S type around.
    you had 2 before, and must know if they are good enough.

    A 4.2 will use a lot more sat at traffic lights (which is all we do these days) and more driving thru town in traffic
    XJR 2001 Pacific Blue
    Range Rover Sport 2005 Red 2.7 TD

  3. #3
    Senior Member rchiv's Avatar
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    There is something to be said for going for a V8, the ultimate must have.
    As for fuel consumption, who cares
    Go for it.

    Roger
    HEY I THOUGHT I HAD RETIRED, Ex Auto Electrician
    2006 X Type 2.2d SE Manual Estate. Zircon Blue Champagne/Mocca, F/R Parking sensors, ,Auto Lights, Auto Wipers, Headlight Washers, Sat Nav 2012 update, 17 in Wheels, 122K Mods:- Electric Autofold Mirrors on Locking
    Simple Autofold Mirrors on Locking,http://www.jaguarforum.com/showthrea...irrors+locking
    UPDATE YOUR SIGNATURE http://www.jaguarforum.com/showthread.php?t=91945

  4. #4
    Senior Member Jim_S-V6_2004's Avatar
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    We can't justify an STR to wifey.

    How about an XKR or XJR, would she like one of these better?

    If none, go for your choice and say it's an opportune buy because they are occasionally available under £5,000 and will go up.

    Forget both mpg and tyres, you'll get through 2 sets of rear tyres in a year if you have fun.

    I will when I get one!

    .

  5. #5
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    My 4.2 does about 1-2 mpg less than my old 2.5 around town, on a long distance cruise the best I have ever had on the 4.2 was 35 mpg, the 2.5 managed 37 mpg under similar driving conditions.

    But the real benefit is the fantastic noise when you give it some stick.
    Last edited by graham-r; 29-07-19 at 09:05.
    S Type 4.2 SE Plus 2002 original spec: Xenon HID/SatNav/Voice/Cassette Player/CDC/TV/GSM Phone/Sun Roof/Rear Blind/CATS.
    Retro-fitted: CD Player/Bluetooth Phone/Aux Power Socket, USB & Volt Meter in Boot/Reversing Cam/Dash Cam & PSU/Dual USB sockets in Armrest/
    Wireless Phone Charger under Instrument Surround.
    Pictures of technical stuff

  6. #6
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    I've seen others say that the 4.2 does about 1mpg less than the 3.0 overall.

    I think the reason is that they weigh roughly the same so the energy required to do things is about the same. The 4.2 is a little heavier and as it has more power available the throttle will be open less which means higher losses (aka pumping/throttle losses). Also, the 4.2 may in practice have larger (so, heavier) wheels/tyres. Things like these do make a difference, just not a huge one.

    The 4.2 does have really great power delivery even in NA (not SC) form!

    With the way things are going I'd be tempted to scratch any 4.2 itch now because it may be more or less the last viable chance...

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    Senior Member Jim_S-V6_2004's Avatar
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    If you have an STR or other 400bhp cat and poodle around getting 25+ mpg, and poodle on motorways getting 35mpg...

    Sell it!

    I would expect 12-15mpg booting between traffic lights and 21-25mpg on motorways testing speed cameras.

    .

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  10. #8
    Member 1955davidr's Avatar
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    We have a 4.2 XJ and a 3.0d XF, the 4.2 averages 400 miles per fill up and so does the XF, the 4.2 costs around £100 per fill up and the 3.0d around £80. Smiles per gallon wins every time and have never used the XF over the XJ on an mpg basis.
    Current Jags

    2009 XJ8 4.2 Executive Porcelain White
    2009 XF 3.0D PL in Cashmere

    Previous Jags

    2006 S-Type SE 2.7D in Prism Blue
    2008 XF 2.7d premium luxury in Pearl Grey
    2007 XK Convertible Midnight Black currently MIA presumed incinerated at Echo Arena New Years Eve 2017
    2004 XJ8 3.5 SE Zircon Blue
    2008 X Type Sovereign Auto 2.2D Glacier Blue
    2005 S Type SE 2.7D Auto Zircon Blue
    2003 X Type SE 3.O Topaz
    2001 XK8 4.0 Pacific Blue
    1978 XJ12L 5.3 V12 Tobacco Brown with Black Vinyl roof

  11. #9
    Senior Member barryhi's Avatar
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    For what it’s worth .... Jaguar figure are: ( taken from Autotrader)

    3.0 = 17.3 urban - 26.2 extra urban - 36.0 combined
    4.2 = 16.5 - 24.6 - 34.4
    4.2SC = 15.3 - 22.6 - 30.7

    so not huge difference really.
    Currently: S-Type 3.0 SE 2007
    -------------------------------------------------------------
    S-Type 3.0 Sport Auto 2004
    S-Type Spirit 2.7D Auto 2007
    S-Type 2.5 SE Auto 2004
    2 x 2.1 X-Type SE
    2 x Xj6 (1 x 4.2 litre & 1 x 3.4 Litre)
    Daimler 2.8 Litre

  12. #10
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    Quote Originally Posted by Jim_S-V6_2004 View Post
    If you have an STR or other 400bhp cat and poodle around getting 25+ mpg, and poodle on motorways getting 35mpg...

    Sell it!

    I would expect 12-15mpg booting between traffic lights and 21-25mpg on motorways testing speed cameras.

    .
    I want to keep my license, and keep it nice and shiny

    And anyway there are always plenty of chavs in their chavmobiles to embarrass when the need arises, which is surprisingly often....
    S Type 4.2 SE Plus 2002 original spec: Xenon HID/SatNav/Voice/Cassette Player/CDC/TV/GSM Phone/Sun Roof/Rear Blind/CATS.
    Retro-fitted: CD Player/Bluetooth Phone/Aux Power Socket, USB & Volt Meter in Boot/Reversing Cam/Dash Cam & PSU/Dual USB sockets in Armrest/
    Wireless Phone Charger under Instrument Surround.
    Pictures of technical stuff

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