also remove anything thats also goin to make wind resistance, like extra lights, roofrack and so on, also if its just you on the trip think about removing some seats to reduce the weight if you really desperate to get more mpg

discomania said:

It's like our V.Power or ultimate diesel.

Click to expand...

Bio-diesel can have the same effect - higher cetane rating.

I would worry about using cruise control under heavy load. It can cause the engine to rev very high on hills, and I think the sudden shift may have cotributed to a blown gasket on mine a few years ago. Aim to keep your reve around the 2000-2250 mark for max. efficiency.

PASTMASTER said:

Bio-diesel can have the same effect - higher cetane rating.

I would worry about using cruise control under heavy load. It can cause the engine to rev very high on hills, and I think the sudden shift may have cotributed to a blown gasket on mine a few years ago. Aim to keep your reve around the 2000-2250 mark for max. efficiency.

Click to expand...

In theory you are right, but in practice if you set an upper rev limit of 2250rpm on an auto TD5, with long motorway hills and 3+tons on the back, you'll be down to 2nd gear and 25mph !!!

thebiglad said:

In theory you are right, but in practice if you set an upper rev limit of 2250rpm on an auto TD5, with long motorway hills and 3+tons on the back, you'll be down to 2nd gear and 25mph !!!

Click to expand...

But would still save on fuel???

If you do the EGR thing and get rid of the CAT from the front downpipe, will that not drastically alter the emissions and thus lead to MOT failures..?

Just bought a 2001 Disco Td5 manual and looking to squeeze every last yard out of the fuel (as we live in the most heavily taxed country in the world!)...driving style does make a huge difference in my experience and I think short shifting where possible helps too...would be interested to know other views on this..?

Thanks in advance...

Stu71art said:

If you do the EGR thing and get rid of the CAT from the front downpipe, will that not drastically alter the emissions and thus lead to MOT failures..?

...

Click to expand...

The EGR is designed to reduce NOx emissions, which are not tested under the MoT. Removal will probably lead to more efficient combustion, which makes a pass more likely! In my experience, the main reason for removal is that the EGR can eventually stick open, leading to a loss of performance. Removal in that case brings a dramatic improvement. Not sure what the cat does on a diesel, but beware - Removal of cats is an MoT fail from this year, but that may just apply to petrol (someone elsewith more knowledge please?...). I've heard rumours that removal of EGR may also be set to become a failure. However on a TD5 all you really need to do is insert a blanking plate. I very much doubt if any MoT garage would notice.

Summary of new MoT regs here: MOT changes from 2012 | AA

Thanks for the link...very interesting...looks like Brussels can still find enough time to dictate yet more rules and regulations to us even with their Eurozone going down the plughole

I guess some people might be removing their CAT most of the year and putting it in place come MOT time then..??? Or would it not be worth the bother..???

In the interests of my own fuel economy I think seat No's 6 and 7 might be going in the loft and the towbar coming off as I am unlikely to be towing anything and I'm sure it'll be both heavy and quite an aerodynamic drag on the car...any opinions on this..???

One thing I've found that saves a huge amount on fuel, especially having had many Volvo 740's 940's in the past as well as Disco 300tdi's, is only keeping enough fuel in the tank to get you where you're going...means more fuel stops, but for anyone who regularly fills their tanks, try putting just 2 or 3 gallons in when the light comes on...it makes a huge difference to the mileage...