200tdi Miles per Tank

Mark Solesbury uttered summat worrerz funny about:

Mark

what is your tanks capacity?... just out of interest.

Lee D

The book says 15 Gallon spot on....

250 miles on a 15G tank........

So thats 16Mpg... Thats Cock.

What can i do to make it more? I dont thrash it..

Could it be over fuelling?

Being a diesel you'd notice a cloud of black exhaust following you if it was overfuelling that severely. After your 250 miles how much fuel did you actually put into it?

It could be leaking somewhere from it's fuel system - leave it idling on a nice clean bit of driveway and have a good look for puddles of diesel forming.

mark usually the 200tdi is slightly more economical than the 300tdi but i think this is purely down to turbo boost pressure on the 200 being somewhat less than a 300tdi and if you [like i did] drop the boost pressure on a 300tdi you get better mpg .

for a 200tdi you should see 26-32mpg registered on speedo , there is a BUT though .

that is because mpg readings vary considerably between landy owners due to tyre sizes used .

if you have standard 90 205x16 tyres then they are more or less the smallest diameter that will be used , hence mpg will read higher than another vehicle using say 7.50x16 or 235x16 tyres .

there are 2 speedo drive for the LT77 box you are using , one is for

205 tyres and other for 7.50x16 , which have different diameters .

basically between a 205 and a 7.50x16 there is 5% rolling difference , and again between a 7.50 and a 235/85x16 there is another 5% rolling difference, the 235/85 being slightly taller than a 7.50x16 tyre .

i have a 2.5n/a 90 with an lt77 box and a 300tdi 90 with an r380 box .

i have checked mine against a GPS and i find that my 300tdi reads 5% low and my 2.5n/a reads 5% high on mpg dervide from speedo measurements .

use a gps and take an exact 10mile drive according to speedo reading and then stop .

check the GPS mileage reading and compare to youre speedo reading, then you will know how far out the speedo is and make an accurate measurment as to how much to compensate speedo measurements by in order to work out actual miles travelled .

then all you need to do is to fill the tank to the very brim of the filler , set oddometer to zero and drive until the next time you fill tank to top again .

note the mileage covered and litres of diesel put into the tank at that point ..

divide the litres of diesel used by 4.546 to get gallons .

divide the amount of miles driven by the amount of gallons of diesel used .

then add the compensation factor of the speedo reading difference , ie if speedo reads 5% low you add 5% to mileage . ie mileage x 1.05

i am not exactly sure on youre actual 90 tank fuel holding capacity , in the RAVE workshop manual it states that a 90 fuel tank useable capacity is 54.58 litres which is 12 gallons and i think max capacity is 60 litres airspace within tank itself .

i know a freind who has a 200tdi 90 and he drives it conservatively and says it will do 360miles to a tank which gives a reading of 30mpg .

my own 300tdi is doing 27mpg with 0.9bar of turbo boost , it was set at 1.2bar previously and returned 25mpg , i may drop to 0.8bar now and just increase mpg a little more .

if you want to back off the black smoke either unscrew the grub screw by about 1 turn thats on top of diaphragm housing [ its located under a

20mm dia blanking plug ] or unscrew the fuel metering [full load] adjuster on the rear of the pump by 1/4 turn at a time until you notice black smoking under load stops , you may also note the performance drops a little , but it was only better before due to the increased fuel input .

to get best MPG figures you need to run the lowest boost pressure you can live with and also keep the injector pump metering backed off on the lean side , oh and of course drive at 50-55mph .

try adding 3 litres or veg oil to youre tank fill of diesel , you will see slightly higher mpg , not a lot but it will be a bit more , due to higher viscosity of fuel .

if you notice , the low sulphur fuels are very thin compared to red diesel or white diesel sold some years ago , hence you use more of the thin stuff per mile !!!! and less mpg .. . low sulphur diesel is really 50% kerosene [heating oil] and 50% white diesel and little else except perhaps a small amount of lubricant [maybe self mixing 2 stroke oil ??] , you could make youre own if you wanted to and lubricate it with 5-10% of SVO veg oil per 10galls .

. .

Mark Solesbury wrote:

I know you've got a 90, but I manage to get about 320 - 330 miles per tank about of my 200tdi 110 CSW, so you should be getting more.............to state the obvious !

A mate of mine swears he gets better mpg by never letting it go below half full, although I've never tried it myself as I'm too lazy to fill up twice as often !

Embo uttered summat worrerz funny about:

I'd say thats got to be utter tosh in the nicest possible way. To start with he is always carting half a tank of fuel around more than normal peeps, secondly is his half measured on the guage which isn't the best method of measuring a half.

I'm sure Landrover deliverately program the top half of the guage to actually read 3/4 of the tank to make you feel the vehicle is economical (in the loosest sense of the word!) That last 1/4 always seems to go as though some one has pulled the plug in all my landrovers... maybe it's the thought of the impending refill though.

God bless LPG!

Lee D

The gauge is logarithmic ..... so it's not full, 3/4, 1/2, 1/4, E ... the only two you can safely assume are right (haha) are full (i.e. fill from E!) and E (i.e. you have stopped...)