2004 C230 just filled up with sainsburys petrol mpg plummet!

Big-Mac-Please

Big-Mac-Please

Big-Mac-Please

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Hellooo!

I have filled my new W203 c-class up for the first time today after picking it up on saturday. The car had been filled with 95ron fuel an was averaging 31mpg.

I read in the book that 98ron was the required fuel so decided to fill up with the closet rating in my area 97ron from sainsburys but immediately after doing this the cars mpg has plummeted to 24mpg??

I had an Audi TT before which always seemed slower when using sainsburys super unleaded. Has anyone else experienced anything like this?

What fuels do you use?

Anyhelp would be great!

Thanx
BigMac
 
i use optimax (or whatever its called nowadays) , only because i want the Ferraris :p (which are always out of stock)
 
Possibly but it just seemed odd, on the way to petrol station was saying 31mpg then after filling up drove to hospital normally as the mother inlaw was in the car and then home again and noticed the drop in mpg?
 
One fillup is hardly enough data to justify your claims its plumeted. A drop like that in MPG could easily be your subconsious thinking OMG 97RON and booting it more.

All data/common sense suggests higher calorific fuels* = better MPG.






*Assumes higher calorific value from the 97ron fuel
 
Yes it was reset when filling up. I will have to see how it goes and if maybe I was giving it the beans a bit. Is it necessary to use super over standard unleaded? I know the book recommends it but just interested in peoples findings.

My TT use to say 95ron was ok but slightly reduced performance where as the mercedes book just says 98ron.
 
In some cars it is. I used 95 once in my old Accord Type-R and it ran horribly. I wouldn't dare try to use it in the integra.
 
Big-Mac-Please said:
Yes it was reset when filling up. I will have to see how it goes and if maybe I was giving it the beans a bit. Is it necessary to use super over standard unleaded? I know the book recommends it but just interested in peoples findings.

My TT use to say 95ron was ok but slightly reduced performance where as the mercedes book just says 98ron.
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if the book recommends it, chances are its been mapped on that fuel and as such should be run on it for best performance

you could use normal, as most modern cars (especially a brand new C class) should have ECUs capable of adapating to different fuels. But generally, follow the instructions in your owners book.
 
I thought it was probably best to but nice to get some second opinions on these things :D

Think I will give Esso super a go next time! Sadly most of the petrol stations where I live have all been taken over by texaco and sell not only their fuel but everything in the shops with a ridiculously large profit margin!!
 
So you drove a reasonable length journey to pick it up, probably with less stopping/starting.
Reset the MPG (which had probably not been reset since before it was picked up), filled up, and drove a short journey to the hospital and back with probably a lot more stop start, and are wondering where 6mpg went?
 
Sounds to me like the initial MPG figure was possibly from the previous owner and the cars merely adjusting to your journey / driving style.

FWIW, supermarket fuel is crap! :p;)
 
lordrobs said:
Doesn't Sainsbury's have a deal with BP for them to supply all their fuel?

I avoid the supermarkets that use Greenergy or whatever they are called but happily fill up at Sainsburys.
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Don't know about that, but I know plenty of ADR Tanker drivers (who pull petrol) and not one would put supermarket fuel in his own car, my old man was advised years back not to put supermarket fuel into his 528i, by his BMW dealer.

There must be some basis to this, what it is in truth, I don't know.

I put any old crap in my Mondeo tbh! :o
 
I pretty much exclusively fill up with Sainsburys 95 RON. I notice 0 difference when I fill up at the Shell near me at home.
 
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