Mercedes fuel economy

I must be bored but decided to do a little economy test on our 2012 Worcester (euro v) with 18000 on the clock, actual weight 3720 kgs with full water tanks, rear tyres at 68psi. Roads dry This is using Asda petrol over 328 mostly motorway and A roads 50/50 with cruise control set at 60mph on motorways.... result 27.4mpg. Thought that was about average or even a tad disappointing so next trip will do exactly the same route and load using non supermarket fuel and see the difference!

Hope you didn't put ASDA petrol in your tank GH,           works better with premium diesel
Boaby

Damn I knew I was doing something wrong

Think yourself fortunate, when we're all offered £2000 scrappage for our vans and forced into buying petrol powered ones we'll be looking at 17.4 MPG...

Heavens forbid going back to petrol, my Volvo estate petrol turbo did 20-22 mpg such a joy in the motorhome I get nearly double that , well middle 30`s -low 40`s. Then you could say motorhomes are driven differently to cars.

Id say thats pretty good Groundhog . My works Transit driven like you stole it - typical white van man style averaged regular 30mpg over 1000s of miles . My Autoquest 130 av. 29mpg with an overcab and the Kemerton about the same both driven like the local vicar....but keeping up with traffic.
       Al , £2000 seems like a good deal:hugegrins:

 Both my Landrovers would only do 25 mpg at 60 mph above that speed it was not worth trying to count just wait for something to fall off. My friend got his Range Rover petrol down to single figures coming back through France.
Our Duetto was never pushed above 60/65 mph and normaly  gave us back about 25mpg. It was the old 2.5 DI engine. The Rienza has the newer 2.4 engine and we were supprised we could get 28 mpg if we kept it about 65mph on decent brand fuel. At 70 mph it can drop considerably depending on the roads. For a coach build with a large body including a luton it proves modern engines make a difference. I try to be sympathetic to engines, what is there to prove by getting there early with a hole in your spending money. Enjoy the journey.

There are two significant factors, weight and speed.  On the motorway we can easily achieve 18mpg but at a steady 56 mph can get high 20's the problem is that I find it easy to lose attention at that speed.

PS the petrol car can get to 15 mpg very easily.....

We just did a Scotland to London trip making a few stops on the way and we averaged 24-25 mpg on standard diesel. Speed was mainly 60 on motorways with occasional bursts of 70 and 50 to 60 on single carraigeway roads. After reading this thread I'll settle for that.

Peter Brown wrote:There are two significant factors, weight and speed.  On the motorway we can easily achieve 18mpg but at a steady 56 mph can get high 20's the problem is that I find it easy to lose attention at that speed.

PS the petrol car can get to 15 mpg very easily.....

Actually Peter I would say 3 , aerodynamics ! Trying to drive a large coachbuilt with overcab beds and all the aerodynamics of a brick into a strong headwind  saw  9mpg heading south 2 years ago ! Driving a van conversion or low roof motorhome  is much more slippery a shape has vastly better dynamics and better mpg as a consequence!

Hi Groundhog, being a tad sad I have kept a record on mine since new and get an average of 26mpg. I don't dawdle (can crack some good overtakes at times when swmbo is asleep  ) drive at speed limits when safe and cruise at a gps 65mph on motorways etc. 
Normally fairly heavy as like to have plenty of water, fuel and gas on board.
So, pretty happy with that .

Just wondering re petrol , have they forgotten all the bad press on that particular propellant? Less horses per bang so have to use far more so more CO2 generated, cancer causing chemicals, high volatility so far more vehicle fires, etc etc etc. Oh, forgot, if they sell more there's more tax revenue 

I'm not quite that good at keeping records, but I generally note the odometer when I fill up before setting off on a long continental trip, note the litres bought en route, then final reading when filling up for the last time on the return trip. Over the last dozen trips it's never varied from 30mpg.

Just come back from Essex. 390 miles at, according to onboard computer(!), 32.4mpg. Kept speed on motorways to about 55.

kaspian wrote:
Actually Peter I would say 3 , aerodynamics

Well I can change the weight and I can change the speed but I've not had the DRS installed yet.

Peter Brown wrote:Well I can change the weight and I can change the speed but I've not had the DRS installed yet.

Very droll!
Nearly spilled my coffee over the keyboard.

Peter Brown wrote:

kaspian wrote:
Actually Peter I would say 3 , aerodynamics

Well I can change the weight and I can change the speed but I've not had the DRS installed yet.

Just completed the exact same route trying to replicate everything and the result is with Asda diesel MPG 27.4 and with Premium brand super diesel MPG 26.8, result on a like for like cost basis was 42p difference! Next time I will try the same test only without trying to save fuel and see what happens!

groundhog wrote:Just completed the exact same route trying to replicate everything and the result is with Asda diesel MPG 27.4 and with Premium brand super diesel MPG 26.8, result on a like for like cost basis was 42p difference!

So the supermarket  stuff was better than the stuff supplied by the people that probably made the supermarket stuff.

There was a time the Tesco own brand (petrol) was both cheaper and more economical than all the others for me (who constantly records & checks his fuel use).

Admittedly this is only for petrol but ITV's Fifth Gear couldn't find much difference in power output between cheap Asda petrol and expensive petrol. https://m.youtube.com/watch?v=WTaBngvsPrc

Peter Brown wrote:

kaspian wrote:
Actually Peter I would say 3 , aerodynamics

Well I can change the weight and I can change the speed but I've not had the DRS installed yet.

Peter,Im sure with a bit of ingenuity and a  chainsaw you could fabricate something! Just dont copy Mclaren s design as they are not doing too well at present!