diesel

[sallom]

Has any one got to get more mpg out of their cars ?

 

[Chaz]

I use Millers diesel additive at every fill up, and at service intervals put a bottle of forte fuel additive in the tank. I do think that by adding them does improve mpg a little. Saying that, basicly it all comes down to your driving and how heavey a right foot you have. With a diesel engine try changing gear at around 2000 revs, petrol at 2500 revs. For best fuel economy try keeping between 50-55 mph. For every 5mph over 60mph you increase mpg by 10%. On average I get 29-30 mpg but can get 32 if I am careful.

Hope this helps

 

[CHASTER]

I don't use fuel additives but in all other respects I agree with Chaz.
However, it has come to something when we are almost constantly having to watch the speedo because there is a direct correlation between your MPH and the width of the smile on MR Darling's face. I suspect Chaz wouldn't have written his post if it wasn't to do with the price of fuel.

No wonder traffic flows slowly when we are all walking on eggs about fuel consumption. It's a form of psychological torture :roll: :roll: :roll:

We are members of the EU so why are British fuel prices not aligned to average European prices.----- UK taxes and duty of course :evil: . Where do our human rights stand in the UK when we are forced to curb our business, social and other activities ; anything involving use of vehicles; because of the restrictive price of fuel.

The hauliers must be livid when they see the other European lorries roll off the ferries with bulging tanks, enough to tour around Britain without (as far as I know) contributing to our road repairs, VAT or excise duty. Don't begrudge them a living at all but it always seems to come back to us Brits paying through our noses. When I say "Brits", in this case I mean the British motorists------but hey ! surely that is MOST of us anyway.

 

[shaggy]

when i have used the supermarket derv i have got around 3-4 mpg LESS than using BP etc
this is in the 3.0ltr surf i had
when driven like miss daisy i could get 26 with BP or around 22/23 with morrisons derv
i did use this product with excellent results
http://www.millersoils-online.co.uk/1_Millers_frame_AUTO_RETAIL-dps4.htm
it ups the octane rating by 2 or 3 points and i could feel the difference when i used it
double dosing makes no difference (didnt with my surf anyway)
the problem with it is the same old story though more power = heavier foot = same or lower mpg
if you can keep driving the same as you have then you can get results
then there is the £10 a bottle price tag :lol:

 

[sallom]

From sallom thanks for the advise. I agree about the tax on fuel, if were in France or the states we would be screaming about it.
All i want to do is go on hoilday with my caravan O and the wife.

 

[iandouglas]

fuel prices

hi i live just outside mansfield out in the sticks .diesel at local is £1.19.9ppl.
in mansfield itself it varies from £1.18.9 ppl to £1.23.9 ppl.
BUT other side of mansfield out in the sticks(Glapwel),
is a jet garage £1.16.9 ppl.
why is the differance so great.
rgds.iandouglas

 

[Terranosaurus]

With a diesel engine try changing gear at around 2000 revs, petrol at 2500 revs.

Good way to ruin a perfectly good engine. Modern engines are designed to use the rev band, especially multivalve ones. Light use of the throttle and allowing the engine to rev properly will save more fuel. Chnging up at too low revs causes you to labour the engine in the next gear, which means you have to apply more throttle than you would have had you have hung on the the gear for 500-100 revs more. People talk about engines coming on cam - this is the point at which the inlet tract, cam shaft and all the other variable in the engine come together to produce their optimum performance, if you can use that point with a light throttle you get a much more efficient burn. All slightly different when you include a turbo but you should be looking to get boost most of the time, no good changiing up and dropping completely off boost - once again you'll end up using more throttle and thus fuel.

Not allowing an engine to rev and thus burn properly also tends to coat the inside of the engine with part burnt fuel, usually referred to as coking up. This coke acts to block the passage of the inlet and exhaust gases and efficiency drops even further. If you molly coddle your engine all the time it will coke up. Build ups of coke can also lead to detonation and/or pinking either of which can ruin an engine.

Taking your engine round to the rev limit or red line is not thrashing it it is using it wll within its design parameters and doing it every now and again can do it a world of good.

 

[Deleted Member S]

Not allowing an engine to rev and thus burn properly also tends to coat the inside of the engine with part burnt fuel, usually referred to as coking up. This coke acts to block the passage of the inlet and exhaust gases and efficiency drops even further. If you molly coddle your engine all the time it will coke up. Build ups of coke can also lead to detonation and/or pinking either of which can ruin an engine.

To add a bit more to what HB has pointed out is at 3,000rpm the inlet & outlet valves start to rotate thus helping to breake off any carbon that has built up on them which in turn will save you from having to have the engine decoked in time, so a good thrashing at least once a week will to your engine the world of good :wink: I must try & remember this & not do it every day :lol: :lol: :lol:

 

[Chaz]

Points taken.

I disagree that it will ruin the engine, changing up at 2000 revs is ok on my truck and I dont labour the engine when I go up a gear. I have been driving for 36 years 25 of those HGV and havent had ruined engine yet. Most of my Vehcles had covered between 50000 and 70000 miles when I changed them and the engines where fine. I have covered 52000 miles with my present vehicle and the engines great, not bad fuel economy, dont use any oil, and starts first time. I am not saying that you should treat them like babys and treat them gentle they are built to take some stick. I do give it a thrashing now and then and have to when I pull the caravan. What I said is TRY changing at 2000 rpm you MIGHT need to go a little further like you said an extra 100 or so rpm so as not to labour the engine. If you listen to the sound of the engine you will know when to change. You can tell if you do change to low and each person gets to know what there own vehcle and will do But at the end of the day the further you push your right foot down the more fuel your gona use