What kind of Octane do you put in your C-Class?
#251
Originally Posted by Outland
BTW, 21MPG, that's pretty low for the 1.8, eh? My 2.3 gets always better than 24 in the city, over 30 on my 50/50 work commute loop.
#252
MBWorld Fanatic!
Originally Posted by mick1
i got the 3.2 liter engine so 21 mpg is all i could get. It's brutal in the city though, sometimes i would see 15 mpg
#253
Originally Posted by E55AMG99
Damn! Something must be wrong. My E55 gets 20/16mpg
I got a C240 loaner car recently and it also averaged 21 mpg, so i thought i was doing well getting 21 mpg on a c320
#255
Senior Member
Originally Posted by revstriker
I get about 21 with the 3.2 with an average speed of around 30mph. That's with the AC running.
GGM
#256
MBWorld Fanatic!
Join Date: May 2002
Location: The blue white rock, third out.
Posts: 2,916
Likes: 0
Received 1 Like
on
1 Post
2002 C230 Coupe(M111)
Originally Posted by E55AMG99
Reality often shows that you will burn more fuel when using an octane rating lower than optimum. When the ECU alters timing, shifting, etc. your engine is no longer runing at peak efficiency. Mileage will suffer in most cases.
Tell you what, I'll challenge you to a tank of low octane fuel, you in your E55, me in my lowly supercharged Coupe. In normal driving, i don't think you'd loose any mpg.
#257
MBWorld Fanatic!
Originally Posted by Outland
Its not about peak efficiency for normal driving. And for everyday driving, you shouldn't be running the engine hard enough for it to matter. It takes so little HP to keep the car moving. And at partial throttle, I'd bet the car makes no less HP than with premium.
Tell you what, I'll challenge you to a tank of low octane fuel, you in your E55, me in my lowly supercharged Coupe. In normal driving, i don't think you'd loose any mpg.
Tell you what, I'll challenge you to a tank of low octane fuel, you in your E55, me in my lowly supercharged Coupe. In normal driving, i don't think you'd loose any mpg.
In simple terms, if the ECU reduces output at a given RPM, you need more RPM to create the same HP. More RPM equals more fuel.
I have run all my cars on various octane rated fuels and the only one that does not result in a statisitcal increase in MPG is the Denali. The E55 now has a Powerchip with 93 octane tuning. The numbers on the CLK and Denali are stock. The 93 octane was a mix of Union 76 91 octane and 100 octane. The 94 octane is what I have in my tank on the lake. Even though most boats claim to be 87 rated, most of them run so much better on the high test. My modified SeaDoos absolutely need it. EGT goes crazy if I run 91.
Here are my notes from both Benzes (commuting 21 miles each direction) and the Deanli (lake house to home 60 miles of mountains and 100 miles of freeway). Some of these numbers are averages from a few tanks but none were more that a tenth or two off.
E55 pre chip - 89 octane 16.4 mpg
E55 pre chip - 91 octane 17.7 mpg
E55 post chip - 91 octane 17.1 mpg
E55 post chip - 93 octane 18.1 mpg
CLK430 - 89 octane 15.8
CLK430 - 91 octane 16.4
Denali - 87 octane 14.7
Denali - 89 octane 14.8
Denali - 94 octane 14.8
When I was building engines for people, this is one way I would determine the correct octane rated fuel for their application. When MPG stops increasing as octane increases, this is the right fuel. Without going back to my notes, I'd say that 90% of the vehicles I tested this way in 20 years showed a statistical change in MPG when octane was lowered.
#258
Senior Member
Join Date: Jun 2005
Location: Gadsden, Alabama
Posts: 302
Likes: 0
Received 1 Like
on
1 Post
'06 C350 4MATIC
Rotten Gas
From the perspective of working as an engineer for Amoco Oil Co for seventeen years I would not suggest using regular grade gasoline in anything other than your lawn mower.
We used to "cut in" "interface" into regular gasoline batches. Sure it was still 99% good-ol gasoline but there was also a component that was anything from #2 heating oil, jet fuel or even water that got into a sump tank.
We used to "cut in" "interface" into regular gasoline batches. Sure it was still 99% good-ol gasoline but there was also a component that was anything from #2 heating oil, jet fuel or even water that got into a sump tank.
#260
MBWorld Fanatic!
higher than 91 octane???
I did a search but couldn't find anything ..... just wondering if there was any performance advantage to using higher than 91 octane in a c230k. Anyone know if the computer will take advantage of better gas (i.e. raise boost level or advance timing or ???)?
#263
MBWorld Fanatic!
Join Date: Jul 2006
Location: SF East Bay
Posts: 1,255
Likes: 0
Received 0 Likes
on
0 Posts
"Double Stuff" SOLD | Nor*Cals "Pesky Audi"
STFF with someting like "octane booster". there was a thread on here not too long ago with regards to octane booster / higher octane gas. A LOT of people had first hand experiences with no advantages at all.
#264
MBWorld Fanatic!
Join Date: Jul 2005
Location: New York City
Posts: 7,424
Likes: 0
Received 3 Likes
on
2 Posts
C55 ///AMG, 535xi
Originally Posted by BadAssC230k
STFF with someting like "octane booster". there was a thread on here not too long ago with regards to octane booster / higher octane gas. A LOT of people had first hand experiences with no advantages at all.
I heard that octane boosters are used in the summer months.
Theres really no difference in "feel" with octane boosters.
but theres a diff if I use 88octane fuel rather than the usualy 93
#265
Super Member
Join Date: Mar 2004
Location: michigan/ohio/indiana
Posts: 917
Likes: 0
Received 0 Likes
on
0 Posts
2013 c300 4matic, 2002 c240
Originally Posted by mtnman82
I did a search but couldn't find anything ..... just wondering if there was any performance advantage to using higher than 91 octane in a c230k. Anyone know if the computer will take advantage of better gas (i.e. raise boost level or advance timing or ???)?
#266
Out Of Control!
Originally Posted by mtnman82
I did a search but couldn't find anything ..... just wondering if there was any performance advantage to using higher than 91 octane in a c230k. Anyone know if the computer will take advantage of better gas (i.e. raise boost level or advance timing or ???)?
#267
MBWorld Fanatic!
Buellwinkle hit the nail on the nose - I now have 95 & 100 octanes available from the pump locally. It's proportionally more expensive than the 91 octane of course, so I would only use it if there was a performance advantage. If Buellwinkle dyno'd with different octanes and says no difference, thats pretty definitive to me. Thanks to all!!
#269
Almost a Member!
Join Date: Nov 2005
Location: St Louis
Posts: 71
Likes: 0
Received 0 Likes
on
0 Posts
06 C230
#270
MBWorld Fanatic!
bnzct - wow ... I even posted in that thread!!! How short lived a memory can be.....
JamE55 - are you running a stand alone ECU, or did you have your stock ECU reprogrammed (or chipped)?
JamE55 - are you running a stand alone ECU, or did you have your stock ECU reprogrammed (or chipped)?
#272
Fuel
If this has been beaten to death already, I sincerely apologize. I did do some searches and never found an answer to my question "can my 06 C230 Sport (no kompressor) run 89 octane E10 and if so, what do you think are the shortcomings". Gas here in Hawaii is starting to go up again (like everywhere else) and was wondering if going to the next lower octane would be ok and what would the trade-off(s) be. Thanks in advance!
#273
Super Member
Join Date: Jul 2006
Location: The OC
Posts: 749
Likes: 0
Received 0 Likes
on
0 Posts
2006 C230SS & 2009 E350
there is lots of discussion about octane here.
https://mbworld.org/forums/showthrea...ghlight=octane
https://mbworld.org/forums/showthrea...ghlight=octane
#274
MBWorld Fanatic!
Join Date: Dec 2006
Location: Toronto, Canada
Posts: 1,105
Likes: 0
Received 11 Likes
on
11 Posts
2019 C300 Wagon; '75 Triumph TR6; previous: 2004 C230 6spd sold after 17 years of driving
Gas is still very cheap in the US and you also have reasonable pricing on premium running about 8-10cents more per gallon.
Here in Canada (let me remind you we are a net producer of oil) our gas is priced at $1.04/litre regular and $1.15/litre for premium. The 11 cents spread to get premium is the killer as 4 litres = 1 US gallon so that is a premium of 44cents per gallon.
Some how the math got mixed up north of the 49th
Here in Canada (let me remind you we are a net producer of oil) our gas is priced at $1.04/litre regular and $1.15/litre for premium. The 11 cents spread to get premium is the killer as 4 litres = 1 US gallon so that is a premium of 44cents per gallon.
Some how the math got mixed up north of the 49th