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Author Topic: Jag trip computer v brim to brim test  (Read 935 times)

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Field Marshal Dr. Opti

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Jag trip computer v brim to brim test
« on: 28 June 2018, 21:36:00 »

The trip computer reads 25.1 MPG for 111.8 miles.

It took 22.82 litres to completely fill the tank again.

Anyone any good at maths?.....because I  can't work it out. :-\
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Re: Jag trip computer v brim to brim test
« Reply #1 on: 28 June 2018, 21:41:43 »

A gallon is 4.546 litres ......

22.82/4.546 = 5.02gall

118.9 miles divided by 5.02 gall = 23.7mpg

Best not to woody about mpg when you're running a Jaaag  :y :y :y
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Re: Jag trip computer v brim to brim test
« Reply #2 on: 28 June 2018, 21:44:37 »

A gallon is 4.546 litres ......

22.82/4.546 = 5.02gall

118.9 miles divided by 5.02 gall = 23.7mpg

Best not to woody about mpg when you're running a Jaaag  :y :y :y

111.8.miles......which makes it worse. :)
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Re: Jag trip computer v brim to brim test
« Reply #3 on: 28 June 2018, 22:06:00 »

My Astra shows 45, brim to brim is 42. A significant difference.
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Re: Jag trip computer v brim to brim test
« Reply #4 on: 28 June 2018, 22:35:26 »

A gallon is 4.546 litres ......

22.82/4.546 = 5.02gall

118.9 miles divided by 5.02 gall = 23.7mpg

Best not to woody about mpg when you're running a Jaaag  :y :y :y

111.8.miles......which makes it worse. :)

I wonder where I got that from ...   :-\    which goes to show why you should always show your workings  ;D
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Re: Jag trip computer v brim to brim test
« Reply #5 on: 28 June 2018, 22:36:45 »

A gallon is 4.546 litres ......

22.82/4.546 = 5.02gall

118.9 miles divided by 5.02 gall = 23.7mpg

Best not to woody about mpg when you're running a Jaaag  :y :y :y

I couldn't spell either ....   ??? ;D
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Field Marshal Dr. Opti

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Re: Jag trip computer v brim to brim test
« Reply #6 on: 28 June 2018, 22:39:12 »

A gallon is 4.546 litres ......

22.82/4.546 = 5.02gall

118.9 miles divided by 5.02 gall = 23.7mpg

Best not to woody about mpg when you're running a Jaaag  :y :y :y

I couldn't spell either ....   ??? ;D

Using your calculations the real MPG is 22.29 and not 25.1.

Only about 90% accurate then.

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Re: Jag trip computer v brim to brim test
« Reply #7 on: 28 June 2018, 22:41:21 »

Only 88 % accurate if I'm being pedantic. ::)

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Re: Jag trip computer v brim to brim test
« Reply #8 on: 28 June 2018, 22:59:23 »

Just as good on fuel as my 3.2 Omega, I really should get a V8  :D
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Re: Jag trip computer v brim to brim test
« Reply #9 on: 29 June 2018, 07:43:43 »

Doesn't sound too bad for such an engine,much can depend of course on how those 111.8 miles were covered-town/distance/mixed driving.Computer on my Elite is showing 14.5 ave at present but that's still altering after I recently reset it and it's only done journeys of not more than 3mls at a time.
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Re: Jag trip computer v brim to brim test
« Reply #10 on: 29 June 2018, 16:52:45 »

My Jag over estimates by about 15% as well, and it seems most do.  I fail to understand why, particularly with direct injection, and even M could get it within 1mpg 25yrs ago...
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Re: Jag trip computer v brim to brim test
« Reply #11 on: 29 June 2018, 16:53:10 »

My Jag over estimates by about 15% as well, and it seems most do.  I fail to understand why, particularly with direct injection, and even M could get it within 1mpg 25yrs ago...
Not that you can explain that to a Jag owner on a Jag forum ;D
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Re: Jag trip computer v brim to brim test
« Reply #12 on: 29 June 2018, 17:05:59 »

Presumably it uses the overreading speedo for its information rather than the drivetrain... :-\
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Re: Jag trip computer v brim to brim test
« Reply #13 on: 29 June 2018, 17:08:02 »

Presumably it uses the overreading speedo for its information rather than the drivetrain... :-\
There was the cynic in me thinking they massively over read the MPG so as to not scare its owners, all of whom are too lazy to check manually, so will argue point blank they all get an easy 50mpg from a 300bhp 3.0l V6 diesel...

...but after reading your comments...

...I still think I'm right ;D
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dave the builder

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Re: Jag trip computer v brim to brim test
« Reply #14 on: 29 June 2018, 17:20:29 »

take it your driving it on roads ? with hills, traffic ,bends , and on days when it may be hot
so , probably not going to get MPG quoted in selling bumf
real world testing is what i do, fill up, reset the trip on the speedo
see how far i get , fill up ,calculate
my 2.6 is about 28 mpg by my maths, the computer says 24
it;s probably upset with me for sorting the N/S level sensor ,so it can't nag me anymore  :P
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Re: Jag trip computer v brim to brim test
« Reply #15 on: 29 June 2018, 17:23:36 »

Wow, I've never seen a (unchipped/unmapped) v6 be more than 1mpg out.

Press and hold the 2 buttons on the stalk - S and R for 3 secs, and post up the 3 figures. I'll check if your config is right.
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Re: Jag trip computer v brim to brim test
« Reply #16 on: 29 June 2018, 17:25:23 »

And I NEVER expect to get anywhere near manufacturers figures. I simply can't drive like our resident Sky employee.
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Re: Jag trip computer v brim to brim test
« Reply #17 on: 29 June 2018, 17:33:53 »

I think it was Darth Lo-knee who said to me "you drive like a cock" ;D
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Re: Jag trip computer v brim to brim test
« Reply #18 on: 29 June 2018, 17:37:58 »

Wow, I've never seen a (unchipped/unmapped) v6 be more than 1mpg out.

Press and hold the 2 buttons on the stalk - S and R for 3 secs, and post up the 3 figures. I'll check if your config is right.
Ok , thanks , will do soon , :)
 just taking pics of bonnet catch thingey for help on another thread
And I NEVER expect to get anywhere near manufacturers figures. I simply can't drive like our resident Sky employee.
I'm still driving like a girl  ;D getting better with the omega , but it's a big change from my Carlton
(which returned 30 + MPG  ;D )
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Re: Jag trip computer v brim to brim test
« Reply #19 on: 29 June 2018, 18:35:11 »

Wow, I've never seen a (unchipped/unmapped) v6 be more than 1mpg out.

Press and hold the 2 buttons on the stalk - S and R for 3 secs, and post up the 3 figures. I'll check if your config is right.
Can't seem to get any config data or code by pressing s (on left stalk) and R (on right stalk) for 3 sec. engine on or off (accessory position)
just scrolls through the normal tripe like trip dist 575.7 , consumption 0 =19.6 trip consumption 0= 45.2 speed 0 =22 M/H
so that has changed since i last looked  ???
maybe i need to read that book in the glove box  ;D
also ,whilst I do not let peasants reside on my back seat ever, i do carry a boot full of tools ,probably the equivalent weight of a couple of fat people , dunno if that makes a difference   :-\
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Re: Jag trip computer v brim to brim test
« Reply #20 on: 30 June 2018, 22:12:24 »

Both buttons on right (wiper) stalk, labelled S and R (from memory - mine is NCDC equipped)
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Re: Jag trip computer v brim to brim test
« Reply #21 on: 30 June 2018, 23:39:18 »

And I NEVER expect to get anywhere near manufacturers figures. I simply can't drive like our resident Sky employee.

22.8mpg average currently on the 3.2, not been reset since last year.

It does run far, far better now itís my daily commuter and not used just weekly for odd run.
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Re: Jag trip computer v brim to brim test
« Reply #22 on: 01 July 2018, 09:09:45 »

24.0 from my 3.2 with no motorway driving. Im now officially a slower driver than Tunnie. YAY.  ;D
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Re: Jag trip computer v brim to brim test
« Reply #23 on: 01 July 2018, 10:43:58 »

24.0 from my 3.2 with no motorway driving. Im now officially a slower driver than Tunnie. YAY.  ;D
I managed 35mpg over last couple of tankfuls (I was actually able to fill it at Tescos yesterday now fuel prices have eased, to calculate the readings).  I'm a bit embarrased that clearly I'm not trying hard enough.


For Opti's benefit, the FC claimed 39mpg
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Re: Jag trip computer v brim to brim test
« Reply #24 on: 01 July 2018, 11:15:10 »

Both buttons on right (wiper) stalk, labelled S and R (from memory - mine is NCDC equipped)


is that the config ? TIA
save me getting out the code reader  :-X

so,less than 20 mpg ?
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Re: Jag trip computer v brim to brim test
« Reply #25 on: 01 July 2018, 11:18:47 »

Let me look that up, as I'm sat in bath doing nothing else
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Re: Jag trip computer v brim to brim test
« Reply #26 on: 01 July 2018, 11:22:58 »

084 is correct for Y26SE with 225/55/16 tyres and HID headlights.
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Re: Jag trip computer v brim to brim test
« Reply #27 on: 01 July 2018, 11:31:45 »

Let me look that up, as I'm sat in bath doing nothing else
thanks , no rush
I know i get better than 20 MPG but it may be a GIGO issue as i still not read the manual ,dunno what the buttons do  :-[
084 is correct for Y26SE with 225/55/16 tyres and HID headlights.
yes , tyres are correct ,hid dipped beams  :y

maybe i need to reset the computer when i fill up
i did have that issue with missfire recently (new plugs and coil pack fitted )
thanks for the help  :y
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Re: Jag trip computer v brim to brim test
« Reply #28 on: 01 July 2018, 12:34:12 »

Yes, reset at next brim, and then check it when you brim again, and compare you manual calculations over same period.

If there is any discrepancy (>1mpg), worthy of investigation, as the GM ones seem to be bang on (assuming maps haven't been fiddled)
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Re: Jag trip computer v brim to brim test
« Reply #29 on: 01 July 2018, 12:38:39 »

Yes, reset at next brim, and then check it when you brim again, and compare you manual calculations over same period.

If there is any discrepancy (>1mpg), worthy of investigation, as the GM ones seem to be bang on (assuming maps haven't been fiddled)
Thanks alot  :y
will do
and I will read that book in the glove box ....... one day  ;D
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Re: Jag trip computer v brim to brim test
« Reply #30 on: 01 July 2018, 12:42:04 »

and I will read that book in the glove box ....... one day  ;D
Waaaay, steady on chap ;D.  No need to get in touch with your feminine side if you don't want to.



(I confess, I read a PFL one cover to cover before I bought my first, for research purposes. In same way I read the (really crap) XJ manual cover to cover before looking at any)
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Re: Jag trip computer v brim to brim test
« Reply #31 on: 01 July 2018, 13:01:40 »

and I will read that book in the glove box ....... one day  ;D
Waaaay, steady on chap ;D.  No need to get in touch with your feminine side if you don't want to.


That's a very good point , I could get Mrs Builder to read it . and ask her what to do  :y
there's a lot more tech on these omega things than my departed Carlton
 (which i'm still finding parts for squirreled away , whilst hiding new parts i'm stocking up on for the mega )
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Re: Jag trip computer v brim to brim test
« Reply #32 on: 01 July 2018, 14:07:01 »

24.0 from my 3.2 with no motorway driving. Im now officially a slower driver than Tunnie. YAY.  ;D
I managed 35mpg over last couple of tankfuls (I was actually able to fill it at Tescos yesterday now fuel prices have eased, to calculate the readings).  I'm a bit embarrased that clearly I'm not trying hard enough.


For Opti's benefit, the FC claimed 39mpg

Presumably in the Jaaaag rather than the Omega !  :o
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Re: Jag trip computer v brim to brim test
« Reply #33 on: 03 July 2018, 09:33:17 »

And I NEVER expect to get anywhere near manufacturers figures. I simply can't drive like our resident Sky employee.

22.8mpg average currently on the 3.2, not been reset since last year.

It does run far, far better now itís my daily commuter and not used just weekly for odd run.

I get 27-28 mpg out of my 3 litre S-Type which gets driven fast used every day.


Oh wait, that's the ford jaaaag computer reading.  Let me do a brim test and get back to you  ;D
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Re: Jag trip computer v brim to brim test
« Reply #34 on: 03 July 2018, 17:16:36 »

And I NEVER expect to get anywhere near manufacturers figures. I simply can't drive like our resident Sky employee.

22.8mpg average currently on the 3.2, not been reset since last year.

It does run far, far better now itís my daily commuter and not used just weekly for odd run.

I get 27-28 mpg out of my 3 litre S-Type which gets driven fast used every day.


Oh wait, that's the ford jaaaag computer reading.  Let me do a brim test and get back to you  ;D

 23-24 MPG. :)
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Re: Jag trip computer v brim to brim test
« Reply #35 on: 04 July 2018, 18:53:13 »

And I NEVER expect to get anywhere near manufacturers figures. I simply can't drive like our resident Sky employee.

22.8mpg average currently on the 3.2, not been reset since last year.

It does run far, far better now itís my daily commuter and not used just weekly for odd run.

I get 27-28 mpg out of my 3 litre S-Type which gets driven fast used every day.


Oh wait, that's the ford jaaaag computer reading.  Let me do a brim test and get back to you  ;D

 23-24 MPG. :)

Still better than the XJR was.
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