Birty Dastards Jeep Club

Tech Forum => Workshop => Topic started by: jarekjeep on August 18, 2012, 10:06:42 PM

Title: fuel consumption in XJ 4.0 High O.
Post by: jarekjeep on August 18, 2012, 10:06:42 PM
i know its juicy but,,,
13.0litres every 100km (around 22mpg-imperial) when driving motorway with cruise contol set on 70mph is it ok?
please write how juicy is your -dont tell me once it was 40mpg , or once it was 8mpg. please detail town mpg/motorway mpg/your opinion about mine mpg.
let it be in the form:

2rd all the way
M -22mpg at 70mph
T -15mpg at various speed, start/stop traffic etc
your (i mean mine) is s... or bit to juicy or whatever.

thanx

Title: Re: fuel consumption in XJ 4.0 High O.
Post by: Lornaben on August 18, 2012, 10:19:07 PM
Perm 4WD
M - 26+ cruise on at 75
T - 15 with a heavy foot  :003:
 
Title: Re: fuel consumption in XJ 4.0 High O.
Post by: Jeepjedi on August 18, 2012, 10:28:41 PM
get a tune up  :icon_winkle:
Title: Re: fuel consumption in XJ 4.0 High O.
Post by: jarekjeep on August 18, 2012, 11:24:19 PM
Are you serious Lornaben? 26+ when cruise on 75mph
Title: Re: fuel consumption in XJ 4.0 High O.
Post by: jarekjeep on August 18, 2012, 11:25:57 PM
jeepjedi who you want to tune up?
Title: Re: fuel consumption in XJ 4.0 High O.
Post by: Brynjaminjones on August 18, 2012, 11:40:35 PM
According to the computer I average 17.1mpg, and that's a lot of short journeys in country lanes, plus about 40 minutes on fairly hilly 60mph roads a few days per week. I do like to make use of overtaking lanes though, particularly when some idiot in a lowered Corsa thinks that he out-accelerate me going up a large hill!  :003:

Forgot to mention - that's in full-time 4wd
Title: Re: fuel consumption in XJ 4.0 High O.
Post by: jarekjeep on August 18, 2012, 11:47:19 PM
thanx brynjaminjones. is it something wrong with mine xj or my style of driving. i did 13.5 on motorway in pensioner way. maybe it was to slow
Title: Re: fuel consumption in XJ 4.0 High O.
Post by: Lornaben on August 18, 2012, 11:58:42 PM
Are you serious Lornaben? 26+ when cruise on 75mph
Yep. serious.
Don't forget your Jeep is telling you american mpg, you need to convert it to real mpg (imperial) your 22 is really 26.4  :icon_winkle:
Title: Re: fuel consumption in XJ 4.0 High O.
Post by: jarekjeep on August 19, 2012, 12:18:26 AM
my on board comp says just the temp and direction im going cause its 96 model. i did calculate it. i did fill to full, then i drive 26o miles on motorway -had to go pick up tyres- and re fill to full again. on receipt i had quantity of petrol i have refill and had a mileage of my journey. i did calculate it in km/100kilometers and converted it to imperial mpg. its still to much, dont you think?
Title: Re: fuel consumption in XJ 4.0 High O.
Post by: Nosebolt on August 19, 2012, 12:50:17 AM
Mines a ZJ but same basic engine and I get 31mpg at 65mph and 18mpg around town with my normal sedate driving, using the loud peddle it's single figures.

and there is a full set of calculators here on Birtys (http://www.birtydastards.com/frm/index.php?action=ezportal;sa=page;p=21)
Title: Re: fuel consumption in XJ 4.0 High O.
Post by: bgbazz on August 19, 2012, 03:43:57 PM
If it were me, I would follow Mr Jedi and get a tune and a full service first. Something as simple as a cruddy air cleaner element can cause high fuel consumption..and so can the wrong tyre pressures!
Start with the simple things and work your way up.  :icon_winkle:
Title: Re: fuel consumption in XJ 4.0 High O.
Post by: isle of man on August 19, 2012, 03:49:40 PM
What is fuel consumption?? It needs fuel you put it in!!!!
Title: Re: fuel consumption in XJ 4.0 High O.
Post by: daggie on August 19, 2012, 05:16:27 PM
 :imwitstupid:
Title: Re: fuel consumption in XJ 4.0 High O.
Post by: Panic mechanic! on August 19, 2012, 05:47:26 PM
if it s that bad it could be down to the Oxygen sensor not working or on its last legs
Title: Re: fuel consumption in XJ 4.0 High O.
Post by: donk498 on August 19, 2012, 05:55:47 PM
When you can get 65 miles to 75 litres of lpg then you have to worry. (fucked  stat) Your mpg sounds about right for a normal xj. I run around 13 mpg average.
Title: Re: fuel consumption in XJ 4.0 High O.
Post by: johnboybop on August 19, 2012, 08:17:46 PM
i get 14 mpg n0 matter how i drive, cant remember the last time i did over 55 mph,
its about 150 miles per tank, big tyres on an offroader,
Title: Re: fuel consumption in XJ 4.0 High O.
Post by: jarekjeep on August 23, 2012, 10:12:58 PM
motorway- 4x4 ft at cruise control set on72mpg -22mpg
town -Londons rush hours 4x4ft -15mpg
Title: Re: fuel consumption in XJ 4.0 High O.
Post by: Dave69 on August 23, 2012, 10:39:06 PM
 :iagree:

i got the same with 33's and 6" lift

got it in the 10 when heavy on the right foot
Title: Re: fuel consumption in XJ 4.0 High O.
Post by: jarekjeep on August 23, 2012, 10:44:09 PM
 :017: upps, i have no mods-just mud tyres. looks bad. before test changed filters and oil, plugs -looks ok-did not change. should i do it?
Title: Re: fuel consumption in XJ 4.0 High O.
Post by: daggie on August 24, 2012, 07:38:40 AM
swmbos xj averages 18-20 mpg  :steeringwheel:
Title: Re: fuel consumption in XJ 4.0 High O.
Post by: jarekjeep on August 24, 2012, 11:01:59 PM
anyone? come on, please. how many miles you do on gallon. Town /motorway.
Title: Re: fuel consumption in XJ 4.0 High O.
Post by: daggie on August 25, 2012, 07:38:54 AM
anyone? come on, please. how many miles you do on gallon. Town /motorway.
swmbos xj averages 18-20 mpg  :steeringwheel:

 :icon_winkle:
Title: Re: fuel consumption in XJ 4.0 High O.
Post by: Bubba on August 25, 2012, 09:00:15 AM
on the overhead thing i get 16 normal 20 on a run so buy the time you convert the figures its still thirsty
Title: Re: fuel consumption in XJ 4.0 High O.
Post by: JamesH on August 26, 2012, 11:34:07 AM
20 mpg average is about right.

New spark plugs, wires, distributor cap, rotor arm, air filter and O2 sensors can all help with mpg but it's never going to be economical
Title: Re: fuel consumption in XJ 4.0 High O.
Post by: j33pky on August 26, 2012, 02:22:19 PM
4ltr 2 door xj with a manual box does 16 around town and i can get 30 if i drive just below 70 on the motorway.
Title: Re: fuel consumption in XJ 4.0 High O.
Post by: jarekjeep on August 26, 2012, 09:30:12 PM
thank you all for answers. f.ck it. tomorrow will drive to Poland and next week coming back.  it looks like no caffee stops on the way -just petrol station. heheh. that's life.:001:
Title: Re: fuel consumption in XJ 4.0 High O.
Post by: jarekjeep on September 09, 2012, 11:38:29 PM
do you know anybody who has comp for jeeps in London or close to it?