MPG Yes I know V8 are thirsty

[dazzawhipple]

Whats the MPG on 3.5 V8 and 3.9 V8  and what sort of reduction do you get on LPG

Thanks

Darren

[paul_humphreys]

V8 carbs 8-20 mpg about the same for EFi. Gas gives about double per pound less about 10%. Well mine use to.

Paul

[suggs]

i dream of getting 20 out of the Hybrid 8)

[beast5680]

on my disco i can get about 16 if i lay off the loud pedal but down to 8 if i hammer it  :lol:

[mark.yellow.series.3]

i dont know what mine will do as the odometer is broke on the antichrist. my be just as well :lol:
but when the engines ticking over i can hear the fuel pump ticking faster then id like

[beast5680]

probably cheaper just to flick tenners on the fire than run a V8 :lol:  :lol:

[jjsaul]

the 110 does about 12mpg - 3.5v8 on strombergs running LPG

RRC (3.5 Flapper EFi) does 8mpg if i drive it hard (which i do most of the time) can get 16+ apparently. also on on LPG. about 16pence a mile on fuel at the last count.

thats with local LPG at 34ppl.

[mark]

Well I get 16 to 20 MPG on Petrol and 11 MPG on Gas.
I had the gas turned down and managed to get zero emissions which would of made a big difference to the economy however Zero emissions was accompanied by zero power, so I turned it back up again.
I am running 235/85/16 instead of the standard 205 which also makes a difference to the fuel consumption.

[Grant]

I get around 17 average, as much as 22 on a good run with the 4.6. New plugs, leads, perfect tyre pressures & turning the air-con off when not using it helps a lot. The 4.0 i used to have was no different. I'm also considering converting to LPG so i'd like to see what the real world mpg difference would be

[p4203]

run a 3.5 efi with 31x 10 x 15 grizzlies every day smiles per mile thats all there is to say :D  :D  :D

[Vauxuki]

My old classic was averaging 18mpg running on gas.
The rangie was bog standard, with the exception of the engine, 3.5 high compression, big valve heads, running SU carbs.
Typical journey 20mile round trip to work everyday.
Never got more than about 15mpg on petrol, but wasnt very often i used petrol.

[clairedave]

our standard range rover classic,does 15mpg on petrol and 14.5 mpg on lpg.she is a 3.9efi; :D

[Garth]

13 MPG on LPG round doors, Off Road, Towing Van etc.
But have recently found out that advance and retard diaphragm was NG so have replaced and not had re tuned yet.

[DaveS]

My Classic 3.5 efi auto does about 15-18 mpg on petrol, don't have LPG as the cost of conversion isn't justified for the low mileage I do!

[Holyzeus]

16 out of mine, SD1 engine on strombergs, 235/85 mud's

[Skywalker]

probably cheaper just to flick tenners on the fire than run a V8 :lol:  :lol:

Sounds about right  8)

V8 Disco ES Auto ....  12mpg, can get up to around 14 if you dont press the throttle much  :shock:   ..................   but where's the fun in that  

Dave

[thermidorthelobster]

Mine's been doing about 8mpg, down to about 6mpg with a strong headwind, and probably something like 3-4mpg in sand.  But then, it does weigh 5 tonnes.

[Old Warthog]

Right then,  just bought a 3.9.  Put 70 quid in yesterday (asda) whict then showed half a tank.  Argggg  :roll: .  But since done 200 miles and still shows half.  :shock:   It's a 1986 auto witn (anecdotally has a 3.9 mid nineties police engine in it).  On guesswork, about 18 to 20 I'd say.

Cheers

Keith
Given in to the Green Oval

[Old Warthog]

Ooops,

I forgot to say, don't they just sound great.

Kickdown obsssed nutter

Keith

[Range Rover Blues]

Blue is on a draw-through LPG system (that's out of date BTW) and does better than 3 miles per litre, perhaps 3.3 on a good day if the engine is running spot-on.  That's probably a bit lean.

RRR has just been LPG'ed on a multi=point and the first tankfull did 160 miles, that's 60 litres. If should improve a little as the system beds-in but it was tuned for a balance of power and economy.  You can do that with multi-point.

Now I've never bettered 16MPG but with the aircon on I can make £80 of fuel dissapear in 180 miles.  I'm glad I'm not the only one seeing economy in single figures.

One blessing, it's no worse with the caravan on.

[Jonny Boaterboy]

I have a 1994 3.9 V8 and if Im lucky it will do 16 mpg. I actually brought it with the intention of converting it to gas as my sums caculated that that would be the cheapest way to run a Range Rover + you get a v8 as well! However I have had it for a year now and have decided not to covert it now.... for these reasons.
1) to get the conversion done properly by someone is, a best, £1000 and I dont have that sort of cash lying around. it would, at current prices take a few years to get this back
2) The tax relief on gas is to go next year (so I'm told) making gas more exspensive taking longer to get your money back on the conversion
3) For me, theres alot under the bonet already adding something else to go wrong is not a good idea
4) I have air surspension..... where do you put the tank? you can replace the fuel tank and put a gas tank there and have a long range tank put in....... more cost! In the boot is not an option as part of the apeal for a range rover is the space
5) You lose power....... ok only a small amount but its still lost!
6) Some people say it dosn't damage the engine some say it does.... I dont want to be the test car!

and finaly we all spend our money in different.... some down the pub, others on T.V.'s and sky, some on children, some on exspensive holidays well I have none of the above and choose to waste my money on petrol!

Its a V8........... none of us brought it thinking it was good on fuel economy so enjoy it dont watch the fuel gauge watch the off roading terrain in front!

(and plant some trees to make up for your enjoyment!)

[Range Rover Blues]

To answer your concerns Jonny

1) it cost me £1250 for a full on multu point sytem with torriodal tank, that's the dogs doo-dahs of systems at the moment.  I'm fitting it myself so it's done right.

2) I havn't heard anything about the tax, LPG is a green fuel that the gov't wants us to use.  The alternative is CNG

3) If your car is going wrong all the time you have other issues,  With a LPG system you have a redundant fuel system in the event of ECU failure making it more reliable.

4) I too have air suspension, hence the toriodal tank.  I'll bin the spare (that way I don't add much weight on balance) and put slime in the tyres, which helps them last longer too.

5) Sorry, loose power? only if your system is cr4p and then only a few%  A modrern multi point gives the same power, the difference in driving is unoticable.  With an advance processor on you actually get more power on LPG.

6) Damage the engine? how exactly?  Granted it's advisable to add an upper cylinder lubricant as LPG is a dry fuel but other than that it's a cleaner burning fuel that actualy cleans you engine which will then last longer.  Your oil doesn't get contaminated as fast so that last longer.  It has an octane rating in excess of 110 so the chances of pinking are just not there.  LPG is a better, safer fuel.

[Jonny Boaterboy]

hummm....... I thought I convinced myself not to bother! it always the way you can never find someone who knows how to do things properly when you need them! fancy fiting one for me? Im in telford or could drive to you....  :(bigsmile):

[Range Rover Blues]

I'll tell you what, I can PM the 'phone number of the guy who supplied mine, he will happily talk you through any problems or concerns.  I can 'photo mine when it's done too if you like, but I can't recomend this guy enough.

The bit that takes the time is removing the plenum chamber and drilling/taping the holes for the jets.  I can do this for you if you want to post me the inlet manifold, no sweat.

The other big job is fitting the tank.  The piping is a bit stiff to fit and the wiring is a dodle, if you can solder.

Then you need to plug the ECU into a pc and run an auto set-up program.  I should be doing that now rather than sitting here......



.....oh well.

[Pete5844 as was]

It's a V8 if it does more than 12 mpg it's not set up right.I've found the only way round this is only use it on a Sunday and look at in wpg(weeks per gallon)my little love now does 7 gpw(gallons per week)and if I ever go anywhere other than the bl**dy asda it's gona skint me but that V8 sound makes it all worth while.Pete

[Range Rover Blues]

Conversly during last year's petrol price hike I had the use of a 1.2 litre Micra and the LPG 3.9litre Range Rover you are all more familiar with.  Gues which one cost more pennies per mile :shock:

Left the noddy car at home, went shopping in the beast, it's cheaper :D

[Jonny Boaterboy]

That awesome! thanks alot for you offer Range Rover Blues, Very kind of you its nice to know there are still good people out there. I will definatly keep you in mind if I can get the money together!

Got to fix my air surspension first!

Jonny

[baileys_1984]

just been wales and back for tyres & wheels  :lol:

http://www.torquecars.co.uk/Tuning/uk-mpg-calculator.php

Distance covered:- 280 miles

Litres of fuel used :- 88.50 litres @ cost per litre 0.3590 (pence)
 
 

Your fuel consumption
14.38 MPG  5.09 Km per litre
Averaging 0.11 pence per mile
(40+ mpg for petrol is good under 23 is bad)


best we have had yet normaly get 220 ish to full tank but this time run out at 280
3.9 on lpg 1990 se

[Range Rover Blues]

11 pence per mile :D

[Pete5844 as was]

Hey Range Rover Blues anychance you can tell me what make of snorkle you have and what you had to do to make it fit.Cheers Pete