Which petrol should I put in my CLK 200 Kompressor?

R8Chris

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Just looking for some opinions on which fuel I should be using. Is there any benefit to filling up with the higher Ron fuels. I am getting 28-30mpg on daily use and wondered if I could improve it by changing fuel.
Regards Chris
 

Wighty

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95 I reckon , it's the same engine as mine . have a look inside the filler cap , if it's meant to take 98 it will say so .
 
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R8Chris

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95 I reckon , it's the same engine as mine . have a look inside the filler cap , if it's meant to take 98 it will say so .

It just says 95 but I wandered if using a better fuel would have any benefits. What mpg do you get?
 

Wighty

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image.jpg
It just says 95 but I wandered if using a better fuel would have any benefits. What mpg do you get?
95 it is then , the cost difference will offset any improved mpg (but I doubt you will get any with 98 ) .
About 30mpg on general stuff , up to 36 on a run with the roof up at 70mph , this is on 17 " wheels.
This is the trip computer from a drive to southern Spain this September .
 
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R8Chris

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I will stick to 95 then. Which gearbox setting do you use day to day. Is there any difference?
 

Wighty

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I will stick to 95 then. Which gearbox setting do you use day to day. Is there any difference?
It is mainly used by Mrs W in C mode , I always stick it in sport unless I'm on a motorway and just in cruise . No real difference in mpg . C starts in second gear , S starts in first and holds the revs for longer before changing up .
 
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R8Chris

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So C would be best for wetter weather and S for smile on the face . Thank again for the info, much appreciated.
 

LostKiwi

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If chasing economy then C may give a few extra mpg. Frankly I'd just use whichever feels nicest for what you want to do.
As above 98 in a car designed and mapped to use 95 won't give any significant benefit. The way the ECU works is it starts with timing at a given value then retards it. If you want to get the best from 98 you need more advance on the timing.
 

John Laidlaw

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Not many really need above 95 to be noticeably different and even then...
I experimented with 99 momentum from Tesco which is the only 99 near me, 98 shell , 97 BP and Sainsbury’s 97 and from them all the one which seems to work best is Sainsbury’s! It’s also the cheapest strangely
Ok not very scientific as I haven’t done track timing nor dyno checks with each just purely feel, but I am quite sensitive to how my engine runs
 
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R8Chris

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If chasing economy then C may give a few extra mpg. Frankly I'd just use whichever feels nicest for what you want to do.
As above 98 in a car designed and mapped to use 95 won't give any significant benefit. The way the ECU works is it starts with timing at a given value then retards it. If you want to get the best from 98 you need more advance on the timing.

Thank you for the advice. I'm having way too much fun and enjoying driving again. S mode doesn't seem to make much difference to economy but does drive nice.
 
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R8Chris

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Not many really need above 95 to be noticeably different and even then...
I experimented with 99 momentum from Tesco which is the only 99 near me, 98 shell , 97 BP and Sainsbury’s 97 and from them all the one which seems to work best is Sainsbury’s! It’s also the cheapest strangely
Ok not very scientific as I haven’t done track timing nor dyno checks with each just purely feel, but I am quite sensitive to how my engine runs

Thanks John, Will give Sainsbury a try. Thats my kind of science, Especially if it's gonna give me more smiles per gallon
 
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