Mud-club

Vehicle & Technical => Defender => Topic started by: Matt_H on April 24, 2006, 13:48:18

Title: MPG again!
Post by: Matt_H on April 24, 2006, 13:48:18

Well the 90 is now running sweetly, starts every time first blip of the ignition within 1/2 a seconf, no glow plugs or anything so me is a happy camper... however I always have to worry about something so now I'm thinking about the mpg again.

MPG has not improved since the pump was changed.  On a long run on the motorway sitting at about 60 mph I'm getting about 25 mpg at best, it basically works out at abuot 19p per mile to fill with diesel.

I assume being a modified motor isn't going to help its already poor aerodynamic qualities (external roll cage, 265/75 mud tyres, snorkel, winch, no spot lights though!)

a) should I be worried
b) if I should be worried what can I check next?

I thought maybe the timing could still be slightly out.  I seem to recall I can check the timing with some special tools without having to take anything off the engine - does anyone have them I could borrow - or perhaps give me a lesson on how to do it?

If I can get it down to 15p per mile it would be liable every day transport then :)

Thanks chaps and chappettes!
Matthew

Title: MPG again!
Post by: paul_humphreys on April 24, 2006, 14:59:13

Just worked mine out. Over the 1000 miles I have owned it I seem to be getting 22 mpg. Thats all sorts of driving, but all of it to and from green lanes. Its a 110 HT 200TDI 3 speed auto. So yes yours should be doing more.

Paul

Title: MPG again!
Post by: littlepow on April 24, 2006, 15:56:29

http://forums.mud-club.com/viewtopic.php?t=20355&highlight=

Might help

Title: MPG again!
Post by: Matt_H on April 24, 2006, 17:13:45

Quote from: "paul_humphreys"

Just worked mine out. Over the 1000 miles I have owned it I seem to be getting 22 mpg. Thats all sorts of driving, but all of it to and from green lanes. Its a 110 HT 200TDI 3 speed auto. So yes yours should be doing more.

Paul

the auto shouldn't make that much difference to economy if you are cruising at motorway speeds though.

I get 22 mpg on everyday stuff which like yours is a mix of green laning and travelling on country lanes to and from work.

What the other thread hinted at is tyres and appendages lowering figures.  Certainly in my kit car with the roof down I loose a couple of mpg, so the roll cage on the 90 is probably going to be 1 or 2. so are they tyres and the lift, so even if thats 1mpg for each that's around 3 mpg on top of the 25 making 28 mpg for 'normal'.

What I don't want to do is chuck £100 or more at finding a problem for it not to be that if you see what I mean,  If if I eventually do find the problem every £100 would take 5000 miles to break even if I saved 2p per mile.

So if my fuel consumption is considered lower, where do I start - what can I check that's not going to cost money (I'm comlpetly broke!)?  I've replaced all filters as well as both lift and high pressure pump... What next?  The oil does need changing but that doesn't affect fuel consumption that much does it?  Anyone got some of those timing widgets?

Thanks again
Matthew

Title: MPG again!
Post by: ianc on April 24, 2006, 19:40:53

try looking here
http://www.fag.hiof.no/~frodehaa/engine.htm#Check%20engine%20timing

will give you a hand if you want.

Ian

Title: MPG again!
Post by: Matt_H on April 24, 2006, 21:17:55

that seems easy enough, twidle the frnot thing, chuck the underneath thing, remove the flap and stick in a drill bit :)

Title: MPG again!
Post by: ianc on April 24, 2006, 21:20:48

i'm sure you can cope with that  :lol:

Ian