Vehicle average MPG ?

[Pudsey Bear]

I did a brief check on the last trip, and it was 29mpg ish 2.2 Ducato, but the dash lies to me, tells me anything up to 37mpg but usually around 33.

Bearing in mind the ECU monitors the fuel as it squirts it into the engine, and it can see the miles I've done, why is it so far out?

 

[marchie]

I did a brief check on the last trip, and it was 29mpg ish 2.2 Ducato, but the dash lies to me, tells me anything up to 37mpg but usually around 33.

Bearing in mind the ECU monitors the fuel as it squirts it into the engine, and it can see the miles I've done, why is it so far out?

Dunno, Kev, but I bought a new Ducato when I started my business [13 months before the financial crash ...] and that was slightly more inaccurate on the trip computer fuel consumption! Usually 12%-15% IIRC The fuel gauge on Brunhilde is quite accurate, though. I work on a rolling average of 6 to 6.5 miles per litre fuel consumption, so the first 1.4 tank should see 135 miles covered, and I look to fill up at 400 miles distance, just as the gauge indicates the last 1/4 [65-67 litres consumed], so that I'm not sweating on reaching the next fuel station when we join the traffic jam round the next bend!

Steve

 

[Drover]

2.3ltr 4 ton ducato does 29.9 mpg . Or in the mountains in southern france 27 mpg. It will get more but I get a bit of a line behind me.

My last one with the 3 ltr ford iveco at 4.5 ton was a little different ranging from 16 to 26 mpg depending on the route.

 

[GMJ]

Just using the trip computer on yesterdays trip ( 2.3litre 180 Multijet 2017 Ducato) bearing in mind we are around 4.5t TAG axle, we got 24.5mpg on 130 miles of MWays at a steady 57mph.

 

[Pudsey Bear]

I do tend to trundle in 4/5th when not in traffic as we like to look around not just at the road, I'll do that for 50 miles or so then I cane it in 3/4th for a few miles to burn off any accumulated soot.

 

[exwindsurfer]

I know I can get on a run 500 miles on a tank and it's not easy to work out mpg as I've when from 225 x 70 x 15in wheels and tyres to 225 x 75 x 1 6in wheels and at 70 mph on my speedo I am actually doing 74 mph so I don't bother trying to work it out lolol.
Ps I can live with it lol

 

[mark61]

I know I can get on a run 500 miles on a tank and it's not easy to work out mpg as I've when from 225 x 70 x 15in wheels and tyres to 225 x 75 x 1 6in wheels and at 70 mph on my speedo I am actually doing 74 mph so I don't bother trying to work it out lolol.
Ps I can live with it lol

You don't want to give info out like that on here. The thread will never end,

 

[Geek]

Because of a defective fuel gauge in the past, we always record the details at every refuelling. This is a 4.6T A class on a sprinter base.

After compensating for the inaccuracy of the odometer and averaging over several tankfuls (the variables are how full you get to and how honest the pump was) I get about 22 to 24 mpg. Sometimes as high as 25 and a bit (never reaches 26). I assume 23 as the norm.

If you believe the indash display, 23 would be shown as about 29. If you just believe the odometer, 23 would probably be shown as 25.

 

[Geek]

I know I can get on a run 500 miles on a tank and it's not easy to work out mpg as I've when from 225 x 70 x 15in wheels and tyres to 225 x 75 x 1 6in wheels and at 70 mph on my speedo I am actually doing 74 mph so I don't bother trying to work it out lolol.
Ps I can live with it lol

Most speedos read about 5% high, so if it said 70 you were doing 66.5.

If the dimensions are as stated, the radius of your tyres was 549.75 and is now 575.15 so at an indicated speed of 70 you're now doing 69.57mph.

 

[marchie]

I know I can get on a run 500 miles on a tank and it's not easy to work out mpg as I've when from 225 x 70 x 15in wheels and tyres to 225 x 75 x 1 6in wheels and at 70 mph on my speedo I am actually doing 74 mph so I don't bother trying to work it out lolol.
Ps I can live with it lol

I've seen posts elsewhere, Jeff, where people who changed from 15 to 16 inch wheels reported the speedo reading more accurately ... I switch the Satnav on, even when I know the destination route, partly because it sits on the interior mirror, so is in my eyeline, and partly because it's more accurate than the speedo {and I set the Satnav to give a warning 'bing' as soon as I exceed the speed limit [especially in the 20mph zones]

Steve

 

[exwindsurfer]

Most speedos read about 5% high, so if it said 70 you were doing 66.5.

If the dimensions are as stated, the radius of your tyres was 549.75 and is now 575.15 so at an indicated speed of 70 you're now doing 69.57mph.

The Tom Tom would disagree with you lolol

 

[exwindsurfer]

I've seen posts elsewhere, Jeff, where people who changed from 15 to 16 inch wheels reported the speedo reading more accurately ... I switch the Satnav on, even when I know the destination route, partly because it sits on the interior mirror, so is in my eyeline, and partly because it's more accurate than the speedo {and I set the Satnav to give a warning 'bing' as soon as I exceed the speed limit [especially in the 20mph zones]

Steve

It wouldn't stop binging with me Steve lolol

 

[exwindsurfer]

I always use the satnav Steve .

 

[Nesting Zombie]

Just using the trip computer on yesterdays trip ( 2.3litre 180 Multijet 2017 Ducato) bearing in mind we are around 4.5t TAG axle, we got 24.5mpg on 130 miles of MWays at a steady 57mph.

Thanks for that,
My ‘Boxy’ is a 1999 Tag, 2.5TD & running at around the 4800KG, Done the south over the last 6 months or so, & currently around the Boarders & Lower Scotland.

 

[Deleted member 81036]

I'm not a fantic at keeping a close eye on my MPG but when the fuel prices went berserk some time ago I wanted to see how much my driving was costing me in fuel but my daily/weekly mileage varies so muchand fuel prices were changing so fast, a change in MPG didn't really give me a meaningful picture so I cobbled together a little spread sheet and just keep a simple record of miles, litres and cost. Then, instead of calculating MPG I now calculate MP£.
If you're watching the pennies it can be very meaningful, for any vehicle. It will poke you in the ribs when you want to, for example, "pop down the shops for a loaf of bread" when you see that the fuel might cost more than the bread.
It's certainly encouraged me to cut out those single purpose outings and rather wait and "do the rounds" when that £ counter is clicking away.

 

[barryd]

Thanks for that,
My ‘Boxy’ is a 1999 Tag, 2.5TD & running at around the 4800KG, Done the south over the last 6 months or so, & currently around the Boarders & Lower Scotland.
View attachment 118662

So your van is 4800kg and mine is 3500kg with the same 2.5td Boxer engine yet your fuel consumption is slightly better than mine (I think you said 24mpg) which when I last checked years ago was always around 22. It must be me! Then again your van looks way more aerodynamic than my big white Brick with a Luton overcab.

I'm gonna be dead smug though now and say of the 8000 miles we did touring last year over around six months, 5000 of them were done on this and allegedly it does 139 mpg! Do I win five pounds?

 

[marchie]

I'm not a fantic at keeping a close eye on my MPG but when the fuel prices went berserk some time ago I wanted to see how much my driving was costing me in fuel but my daily/weekly mileage varies so muchand fuel prices were changing so fast, a change in MPG didn't really give me a meaningful picture so I cobbled together a little spread sheet and just keep a simple record of miles, litres and cost. Then, instead of calculating MPG I now calculate MP£.
If you're watching the pennies it can be very meaningful, for any vehicle. It will poke you in the ribs when you want to, for example, "pop down the shops for a loaf of bread" when you see that the fuel might cost more than the bread.
It's certainly encouraged me to cut out those single purpose outings and rather wait and "do the rounds" when that £ counter is clicking away.

I designed my own spreadsheet about 15 years ago and keep adding categories to it as I feel it would improve the costings accuracy, for each year, each category per mile and the cumulative cost [think anorak, hood for the dandruff capture and fur trim ...]. I have Mileage, Depreciation, Servicing/Repairs, Fuel, Road Fund. Insurance, LPG Refills and Finance Costs for each year of ownership [total cost and per mile] and these data feed into an overall cost of ownership [total cost and per mile]. Useful to look at when I last replaced M/Home Items, such as Tyres, Brake Fluid etc, or when I want to scare myself to death at the true cost of running a motorhome ... £3.16 per mile for the current year, or £1.36 per mile if I exclude the non-cash costs [tbf, I was planning on double the annual mileage, but life got in the way ...]

Steve

 

[Fazerloz]

2.3 Ducato 29/30mpg, towing 2 bike trailer 27/28 according to dash readout and I have checked that against filling neck to neck on the fuel tank and the dash readout is bang on.

 

[Fazerloz]

So your van is 4800kg and mine is 3500kg with the same 2.5td Boxer engine yet your fuel consumption is slightly better than mine (I think you said 24mpg) which when I last checked years ago was always around 22. It must be me! Then again your van looks way more aerodynamic than my big white Brick with a Luton overcab.

I'm gonna be dead smug though now and say of the 8000 miles we did touring last year over around six months, 5000 of them were done on this and allegedly it does 139 mpg! Do I win five pounds?

No but you could do to lose five pounds on your diet.

 

[2cv]

2.0 Renault trafic max. 3250 kg gives a consistent 33 mpg.