Fuel Economy
I have been doing a fair amount of distance driving over the holidays and am concerned about fuel economy (ok I know its a gas guzzler...) but what I found is that on highway at a fairly consistent 110-115km/h with temp rock solid at 80 and rpms at about 2800 I am consuming on average a touch under 15 litres per 100km. This is with pre-heating the engine using the webasto and a brand new air filter on flat terrain.
I did have it climb to 19 litres but that was due to a headwind.
The reason I think its strange is that city driving is roughly the same fuel consumption and at times even better. So what (besides wind and hills) could lead to such terrible fuel economy on the motorway? Driving around London last week I was averaging under 14 litres with road works...
Could it be the injectors are feeding too much fuel into the system?
Any advice appreciated.
if memory and experimentation serves then above 55-60 mph the effect of wind resistance etc increases disproportionately.
most economy type runs (furthest on least fuel) that i have taken notice of seem to confirm that this speed works best.
and i must say that with numerous, admittedly older vehicles, this has aleays been the case.
I would agree as I have commented that I took it strange that the Van gives 24.?? regardless of driving style, type of roads, load or no load, local stop start runs or down the motorway for hundreds of miles, I even tried not using the kickdown for a couple of tanks then used it excessively for the next couple of tanks, no disernible difference.
Cheers
marcus
laymens terms 18mpg, at 70mph. i use to get 21mpg from my 300ge at a steady 60mph. lower to 60mph then see what you get. funny how disco get about 30mpg from there engine.
I find that very strange too, Max. I would expect your G to be more economical when driven with care. As a comparison, I get 12.53 litres/100 Km (22.5 mpg) since I own my G300D on regular diesel and 13.09 lts/100 Km (21.5 mpg) on sunflower oil. And I mostly drive flat out all the time....
Curiously, what I drove last Friday, which was mostly on mountain tracks with 15 inches of snow and mud, in short gears much of the time and I still got 13.84 litres/100 km (20 mpg)
there may be some connection with the fuel consumption of the old 6 cyl diesel patrols, this is "hearsay" but when i asked a local farmer why he always seemed to have a sheep trailer attatched, he said "it did not seem to make any difference to the fuel consumption", he was getting i think 20 mpg regardless, and sure if he needed the trailer he had it with him.
they were however low geared, so fleecing them on without a trailer vis-a-vis going slower with a trailer, no odds
the only reason i wonder is i have been trying my darn best to drive conservatively ....
Thanks very much for that statement, it has put my conscience to rest after thinking my right foot syndrome has drastically affected economy!
also read an article on this week's autocar, how airplanes are bigger polluters than cars, yet hardly get any flak for it.
driving economically is like torture...until you get to the pumps of course, then another type of torture begins :twisted:
Thanks guys - got lots of good feedback on a number items to check on the US forums - unfortunately a little costly sounding....
Can anyone recommend a good but reasonably priced diesel specialist to bring it to?
These were the potential problems listed on P3
* Clogged air filter
* Pump calibration
* Faulty injectors
* Partially open EGR (EGR valve or EGR vacuum modulator at fault)
* Clogged up intake manifold (possibly from a leaky EGR)
* Incorrect valve timing
* Faulty boost sensor
* Faulty control rod signal (injection pump)
* Air Mass Meter
get an early 463 or a late diesel 460 maxwell and that wll sort out all your problems :wink: :wink:
after last weeks fun i had in cyprus using alot of GA and higher gears i manged to empty the tank by tuesday night and covered some 255 miles with 59 litres of normal diesel. appx 19.6 mpg and that includes "bombing" it up the kyrenia pass in third at about 55 mph and hitting about 90 mph on the straights :shock:
and thats with 4 gears :!:
:P
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the only reason i wonder is i have been trying my darn best to drive conservatively over the past few months and i still can't match the mpg of my 300GD which on paper doesn't have as good fuel economy as the G300 TD.
I was consistently getting about 12.5 litres with the 300GD at 70mpg / 110km/h. And that I didn't drive conservatively....