MPG

[smallzoo]

Hi there,

I recently went to Scotland with a roof box and family and I am getting about 22mpg. Is that normal ?.. I have not had the car serviced since I bought it 3 months ago from a 4x4 garage but it I guess I should find a good diesel specialist in my area..

Any thoughts ?

I am based near Crewe in Cheshire

I spoke to these guys..

www.dieselpowertuning.co.uk

and it works out at £300 for the product which would mean it would pay for itself in about 2 years

They said the standard bhp of 158 lifts to 178 and the Torque from 323 to 373 . These will be accompanied by an improvement in MPG of about 7-10%.


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Nissan Patrol 3.0Di Turbo GR 2001(Y) 5 door
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[Guest]

I would have thought 22MPG was about right, my sons did around that maybe a touch less. My patrol a lot less.

A lot of people post very optomistic figures on MPG when generally most get quite low figures.

 

[(RIP) PLANK]

I have not owned a patrol but from experience with a lot of large diesel engined 4x4's that does seem about right, leaning towards the fairly good!

 

[JonathanM]

Hi there,

I recently went to Scotland with a roof box and family and I am getting about 22mpg. Is that normal ?.. I have not had the car serviced since I bought it 3 months ago from a 4x4 garage but it I guess I should find a good diesel specialist in my area..

Any thoughts ?

I am based near Crewe in Cheshire

I spoke to these guys..

www.dieselpowertuning.co.uk

and it works out at £300 for the product which would mean it would pay for itself in about 2 years

They said the standard bhp of 158 lifts to 178 and the Torque from 323 to 373 . These will be accompanied by an improvement in MPG of about 7-10%.


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Nissan Patrol 3.0Di Turbo GR 2001(Y) 5 door
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OK, in terms of a "chip" improving economy, then I'm sure some people do manage this, but certainly since fitting a PSI Powerbox I've not had any different fuel consumption, but the car is much better to drive. I wouldn't like to invest £300 and assume that it will mean better fuel economy hence will pay for itself. Anytime more power & torque is involved, more fuel is needed somewhere.

Not using the roofbox will help*, any reduction in drag will improve fuel consumption, a service may help, as might checking the tyre pressures regularly. Loosing weight (from the vehicle!) can help,if you are in the habit of driving around with a boot full of kit that can be the same as always having a passenger.

*if you need the carrying capacity, then remove it when not needed, or even buy a small trailer. When I run with the roofrack fitted to mine, fuel consumption worsens from about 28 mpg to about 25-6 mpg, and the rack possibly has a smaller front profile than a roofbox.

 

[jace]

getting 30mpg cloggin the nav everywhere it goes!

 

[smallzoo]

30 mpg !!

All the other replies say 22 is about right..

Now I am confused.. which is the correct figure to aim for..

Have you done anything special to yours..

Cheers

 

[jace]

nothing just thrashed it! serviced every 5k regluary doing 200+miles at steady 80-90mphloaded with 4 lads and all there kit 5 gallon easily doing 150miles

 

[(RIP) PLANK]

I would say jace's opinion is the one togo for as he has the most simmilar vehicle, but could it be tha the gearing on the car is different? or as JM says the roof box is much more un-aerodynamic than we think?

 

[jace]

think my gearing a bit low its thrashin its nuts off at a ton itll out acelerate the old tdi maverick i had easily acess track i usaully use mav strugle to 60mph with hard braking t stop before big steel gate navara will hit 60mph halfway down with no need for hard braking.

 

[smallzoo]

Soory about this dumb reply but I dont understand how thrashing it gives you more MPG.. do you mena that accelerating in4th/5th slowly will give me less mpg than accelerating hard in 3rd ?

The car has done 94k and from what the paperwork says been regularly serviced by Nissan dealers.

What can I do to check why my motor is doing 22.. are there any particular checks I could ask a garage to do ie compression, filters etc..

Peter

P.s. As you can guess I am no mechanic !

 

[jace]

dont use onboard computer to work your mpg put x amount gallon in tank and use the trip on speedo to see how many miles youve dne to x amount fuel thats how i do it.
by thatrshing it i mean it doesent get driven like sunday afternoon oap in his flat cap doing his 45mph in middle lane m6 if im going somewhere and roads capable doing it its quite happy at 80-90mph seems to be its sweet spot!

 

[Deleted Member]

Last time i worked mine out ,i was getting 30 mpg!! 8)

 

[Deleted Member S]

Smallzoo you are driving a different motor to jace's Navara, your Patrol I would think is alot heavier so would use more fuel & no driving hard you'll use more fuel than taking it easy. The best speed to get the best mpg is 56mph :smile:

 

[jace]

your motor slightly different you will have an intercooler which means your getting more air into cylinders using slightly more fuel each bang i wouldnt think our mpgs are not too different if worked out simply like i sugested i know on the newer navaras untill run in getting rubbish mpg then after a while there taking battery off to re set ecu and on board computer mpg jumps from about 22 to 28mpg.
i thought the 2.7tdi was pretty damn good for power and fuel but three litre even better i dont have an intercooler on mine so cant say how good the uk spec intercooled ones are.

 

[(RIP) PLANK]

Smallzoo you are driving a different motor to jace's Navara, your Patrol I would think is alot heavier so would use more fuel & no driving hard you'll use more fuel than taking it easy. The best speed to get the best mpg is 56mph :smile:

the 56mph thing is not strictly true, at the time the government started with official fuel economy figures the average speed of a vehicle of mised motorway and other roads was considered to be 56mph, so they tested MPH at this average speed, in reality most cars have their own most economical speed, but around 56 is probably not too far out!

but in line with what jace has said many people tend to drive diesels like petrols and change up the gears a little too quickly, you see them on the motorway or when changng down to overtake they suddenly get a huge black cloud of soot as they expel all the excess bulit up by not revving the car qite hard enough (the same goes for diesels at MOT time with exhaust emmisions) driving abit harder (try adding a fuel system cleaner like diesel magic) can clear excess carbons and reduce emmisions and maybe, just maybe improve economy a little?

 

[gadgetsyd]

Smallzoo, the only way to calculate your fuel consumpton is fill the tank to full, set the trip to zero. When you fill up again check the mileage and the ammount in litres to fill the tank. Divide the number of miles by the number of litres, this will give number of miles per litre if you then divide this by 0.22 you get the mpg.

 

[JonathanM]

Most economical speed is the slowest possible, in the highest gear without the engine struggling. So driving everywhere at 40 in 5th would be more economical than 56 in 5th. Wind resistance increases with speed, but the physics are that a doubling of speed doesn't just double the effects of wind resistanmce, IIRC it increases exponentially (?).

I think things to consider are the weight of a patrol, in the scenario the OP gives then I'm fairly certain that the roofbox will have contributed to the fuel consumption, plus the fact that even getting to the Galsgow/edinburgh region involves some nice longish hills to go up.

I'd set the OP off to remove the roofbox, check tyre pressure, get a service and then recheck MPG properly as gadget says, and see what the "norm" is for his vehicle.

 

[smallzoo]

Wow ! a lot of good advice... I must admit I have tended not to rev the engine thinking it would save fuel so I will rev it a bit more and change and little later. I'll also try the diesel magic suggested.

Any more info would still be gratefully accepted !

Cheers

Peter

 

[jace]

no need to red line it just shift that bit higher its a big engine itll take a bitve stick lol

 

[Deleted Member S]

in line with what jace has said many people tend to drive diesels like petrols and change up the gears a little too quickly

I agree with you on this Plank :smile: Most of the time I'll change up at about 3K rpm as it starts to go into the red at about 4K :roll: