timmynabenz

Stock engine, somewhat custom quad Magnaflow exhaust:

nobli

u ******* lol. does the magnaflow really make that big a difference?

laneshift

I know it doesn't at low end. I might get a decimal of a difference. Highway- different story.

Song

Can't believe my eyes, my c230SS is doing around 20mpg in city

aac85

i just had mine installed last week.... and i noticed a slight difference as well

LILBENZ230

Fuel efficiency is relative. The V6 is not fuel efficient in comparison to the 271, especially when you factor in the city grind and those numbers turn mixed. For someone who does a lot of city driving, a 271 car that averages 3-5mpg better can go between 45 and 75 miles longer on a tank (assuming 15 of 16.4 gals used). That's significant for the average city commuter.

However, the real beef with the 2.5 V6 is that it's not more efficient than the 3.5 V6 in spite of the huge power deficit. Comparing the M272 2.5 to the old M112 2.6 makes the 2.5 look good. Comparing it to the other engines offered does not cast such a favorable light upon it.

TemjinX2

low drag coeficient, wide gears definately helps.

e24kgold

+1

dymmeh

come back at the end of your tank when it actually matters

and stop driving down hills

francoisisp

well i guess thats what i get for driving an amg, I havent seen more than 22mpg in years even driving down hill with ac off lol.

timmynabenz

Powerwise it does too me, most people say it doesn't but, idk if its my particular setup or what, but although there is noticeable loss of low end power, i have MUCH more top end power.

Efficiency wise, i just did an informal test with a C230 V6 loaner, and on the same routes, same temperature (within 1-2 degrees), and cruise set at 74 the whole way, my car got a solid 2,3,4 mpg better.
I dont remember exactly but it was like 27 mpg for the loaner and 31 mpg for my car.

I could also notice the difference in power, the loaner had more pep at the bottom of the gears, but passed like a golf cart compared to mine lol

o your back.. yay. thank you for that another post that never fails to put me in a negative mood

but you are right, i think that the power difference in the 2.5 vs 3.5 should yield much better fuel mileage.

i always fill up at a half tank, but i have been averaging around 230 miles to a half tank. sometimes it only lasts 200, one time i got close to 300 miles.

And this wasnt down hill it was on the 5/57 from San Juan Capistrano to Brea

lol
It all depends on your driving carachteristics and habits too. I used to pull up to 18-19 city and 28-29 hwy out of my CLK500 which is NOT normal lol

nlpamg

lol, so you were driving downhill, with some wind behind you right?

timmynabenz

no. lol

5 North from San Juan to Brea

AdidasC230

whats the speed limit on that road, my car gets 27 going 75 but magically gets high 30s like that if speed limits 55 and I got 60

dymmeh

magically? your car is most efficient around 55-65mph.. hence why the increase in MPG when you're going slower.

i think MB themselves say every 5mph above 65 you lose about 7% fuel efficiency.

AdidasC230

yes I say magically because the stupid car get 32 going 85 yet worse at 75 then better at 55, its wierd.

PharmD

Man, that's impressive! I just posted in another thread that my '06 2.5L hit 34.1MPG on a 140ish mile trip a few weeks ago. The warm weather seems to make a world of difference...

W203E35

Maybe it's the gears (RPM)?

LILBENZ230

To get an idea of realistic fuel efficiency you need more than ~20 miles. Here is my car, from tonight:



This was on the return leg from our NC mountains trip.



This is the final result of the trip, from my garage and back to my garage, the mileage was reset at the fill-up I did before the trip. The station I stopped at was sold out of premium, so this result was on regular old 87 octane (spare me the rhetoric, it won't hurt a thing). I should get 450-500 miles from this tank. I'm quite confident the V6 cars (any of them) can't touch this in such demanding situations as mountainous terrain. It's the V6 cars that should to the C230Ks in regard to fuel efficiency, although the M272 E25 should to the M271 in all regards.

timmynabenz

i would disagree, because generally the more miles you drive on the highway the higher mileage you get, so if you can get this at 23 miles.. idk

haha is he really banned.. again?? lol

e24kgold

mine from this morning

sorry for the bad pic- thats 28.2 mpg and 12955miles