Miles Per Gallon

avandriver

Guest
Miles Per Gallon ( sorted see pg 4 )

Does 250 miles on a full tank sound right ?.

35/10 with a 2.8 turbo diesel high top medium wheelbase twin rear wheels


Probably half of that is motorway miles with the other half being around town .
I don't drive like a teenager possessed and never break the speed limits , been driving diesels for many years so I know when an engine is straining and what gear to be in .

Tyre pressures are correct and the brakes are not binding .
My van is a self built camper but it is not full of heavy insulation or overweight fixtures ( even the water tank is empty ) .

The engine runs really well and has got loads of power I have never seen any smoke out of the exhaust ( except when I restarted after a stall ) .

I am thinking that at some point in its history someone has tweaked the fuel pump .


Or am I being paranoid ? .


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Steve
 
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A tank is irrelevant if we don't know the capacity. It could be good or bad. Whats important is what you get to the gallon or litre not what you get to a tank.

I think I must be heavier than you and I get 24mpg even with 160l of water onboard. When wilding I would rather have to pay to haul water around than be without it.
 
Opops left ot the most important figure .


The tank is 70 litres


Steve
 
yes i'm not sure if you're happy or sad but i had one of these and it was brilliant on fuel
 
Very quick estimate assuming 4.5 litres to a gallon (slightly incorrect I know) gives just over 16mpg. That doesn't sound good. The Iveco normally does around 25 give or take a couple I think.
 
Roughly 15.5 gallons. Even at 23 to the gallon should get you over 370 miles.
Most tanks are designed relative to consumption so there should be enough capacity to better 400 miles to reserve if driven carefully
 
16 sounds pretty dire.

I would get it looked at. If it has very high milage then a simple change if injectors could sort it out. Time to have some diags done.

BTW I get 24 driving it over all conditions including 70+ on motorways. I have to admit that I don't drive the MH with economy in mind.
 
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Mine is a 2.8TDI Ducato. I get 10Kms to each liter. Which is 700Kms to a tank, in miles roughly 420 miles, which is roughly 27 miles to the gallon That is fully laden. I never drive over 90 to 95 kms per hour. In the Alps and Pyrennes I get a lot less, about 550 kms to the tank.
 
avandriver said:
Does 250 miles on a full tank sound right ?.

35/10 with a 2.8 turbo diesel high top medium wheelbase twin rear wheels


Probably half of that is motorway miles with the other half being around town .
I don't drive like a teenager possessed and never break the speed limits , been driving diesels for many years so I know when an engine is straining and what gear to be in .

Tyre pressures are correct and the brakes are not binding .
My van is a self built camper but it is not full of heavy insulation or overweight fixtures ( even the water tank is empty ) .

The engine runs really well and has got loads of power I have never seen any smoke out of the exhaust ( except when I restarted after a stall ) .

I am thinking that at some point in its history someone has tweaked the fuel pump .


Or am I being paranoid ? .


DSCF7019.jpg




Doesn't sound to good for a 70 liter tank. That is roughly 418 Kms for a full tank. You should be getting atleast 630Kms to the tank.
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I also find it pointless when people quote so many miles 'to the tank' Does that mean you fill it up then keep going till it runs out or what?
As far as I can see the only way to check it with any degree of accuracy is to fill the tank and record the mileage. Do the driving, fill the tank and record the mileage again. So you know how much fuel you have used for the mileage travelled.
When I was employed to drive lorries I was required to keep a detailed record of all fuel purchased, (because the boss was obsessed with people stealing fuel) so I do it with my own van as well and put it on a spreadsheet as he did.
(currently showing 33.91 mpg over 17,489 miles, Citroen Relay 120 L4 H2 van running at about 3,100 kg gwt. The fuel recorder/computer fitted as standard equipment indicates the van to use about 10% less fuel than it actually does. In the place where I worked this would probably have led to the boss making false accusations that the driver was stealing fuel)
 
BJ is correct. That is the way I do it to find out my Kms/miles to a liter. Fill up and set the trip to "0" On your next fill up, take the reading of the trip and divide the Kms/miles to the amount of fuel on the refill.
 
Bernard Jones said:
I also find it pointless when people quote so many miles 'to the tank' Does that mean you fill it up then keep going till it runs out or what?
As far as I can see the only way to check it with any degree of accuracy is to fill the tank and record the mileage. Do the driving, fill the tank and record the mileage again. So you know how much fuel you have used for the mileage travelled.


Not only that but you have to assume the odometer is accurate I think an allowance of +~ 10 % is permitted. Also diesel fuel foams. Pumps flow at differing rates (more or less foaming) resulting in differing pump cut off points.
My mpg has worked out at 27.8 mpg recorded over 60,000 miles. 4 litre engine, van running @ c. 5 tons. mostly long continental trips.
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To be fair, I suspect that is what avandriver did. I certainly gave him/her the benefit of the doubt when calculating mpg. It is recognised as the normal way to work mpg out accurately. As for foaming and cut off points, I always make sure that I fill beyond these. Cut off points are largely dictated by the neck into which the pump nozzle goes and the design beyond - some 'blow back' quicker than others.

OP - I'd monitor it as mentioned for a few tanks full, and if results don't improve, start investigating. I assume filters etc... have all been recently changed and it has been regularly serviced. If new to you and it hasn't, I'd change the filters, get the gunge from the tank, put in some Redex diesel to clean through the injectors and see if it makes any difference. If there's loads of built up gunk in the tank, it may take a couple of filter changes to get things sorted.

If that doesn't work, and you've inspected for leaks, then injectors would be the next thing, then I would guess the pump. I hasten to add I'm not an expert mechanic, so stand to be corrected on the above.
 
A slipping clutch can also affect your mpg. Have you noticed if you`re revving higher than usual up hills, pulling away etc? I`d also check the gearbox oil level whilst you`re at it.
 
Mine 1.9 fiat Ducato fully laden including water on board around 22mpg,,
 
I reckon to get about 600 miles per tank on the Movano

Fuel tank capacity 90 litres of which I use 80. Bottom 10 litres is on reserve/fuel low light.

80 litres x 0.22 = 17.6 gallons.

I get 33-35mpg combined that's 580 - 616 miles per tank. Movano fuel consumption is fantastic. If you drive it carefully on the motorway letting it coast down slopes with foot off the pedal you can get close to 40mpg.
 
After seeing the mpg some of you guys are getting I think something has to be done .


I have added a large dose of diesel injector cleaner and will see how that goes .

The van had a full service just a month before I got it with all new filters , the clutch is not slipping .

if I get no joy from the redex then I will be looking for a reputable Bosch diesel centre .


Steve
 
Common rail, high pressure injection, a turbo, and computer management like on my engine are great for power and economy.

But they can't be used with veg oil, and are often expensive to repair when they go wrong. Nevertheless I would expect more than 16 mpg on an older type engine. My old CF2 2300 used to do about 25, and that was with a dodgy injector pump and a tired engine.
 
My van is a 4 tonne, 2.8 turbo diesel and I get 25mpg. So your fuel consumption seems to be not very good i am afraid.
 
caspar said:
As for foaming and cut off points, I always make sure that I fill beyond these.
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In that case you are probably losing fuel out of the overflow pipe when it expands on hot days. I used to fill my petrol Rover Maestro van to the second or third click. I once drove home about 2 miles, parked on the drive in hot sunshine, half an hour later smelt petrol and saw it dripping out of the overflow pipe. I had to syphon about a couple of pints out before it stopped dripping altogether. I never knew petrol expanded so much. I realise diesel is not as hazardous as petrol, but you still don't want to spill it on the road.
 
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