MPG
#1
MPG
Hi all: I am new here. I live in Boston and have an 2008 S550 with 224,000 miles on it.
Can anyone tell me the best possible MPG one can get on a highway?
I was hoping for 24 mpg but I am concerned that I might be fooling myself. Also, do you use 93 octane or 91 octane? Any help here appreciated.
One more thing; I was told that the rear wheel drive 550s rides more smoothly than the 4Matic because it does not bite the road in front as it is simply being pushed from behind? BTW, I love this car.
Thanks!
Can anyone tell me the best possible MPG one can get on a highway?
I was hoping for 24 mpg but I am concerned that I might be fooling myself. Also, do you use 93 octane or 91 octane? Any help here appreciated.
One more thing; I was told that the rear wheel drive 550s rides more smoothly than the 4Matic because it does not bite the road in front as it is simply being pushed from behind? BTW, I love this car.
Thanks!
#2
S550 uses (at minimum) 91 octane gas. It's the S600 with the V12 that I believe requires 93.
My 2008 S550 gets me just under 10L/100km (approx 24 mpg) on highway at cruising speed of ~120km/h.
My 2008 S550 gets me just under 10L/100km (approx 24 mpg) on highway at cruising speed of ~120km/h.
#3
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'15 S550, '10 E350 P1/P2, '02 ML320
My 2008 S550 averaged 28 MPG on a round trip from Phoenix to San Diego this year (140k miles on the odometer). The high MPG was 30MPG at 75MPH, which considering my wife and two adult sons were in the car ... seemed pretty good. It's great going to the beach without filling up along the way.
Last edited by dlafever; 10-08-2018 at 04:00 PM.
#5
My 2008 S550 averaged 28 MPG on a round trip from Phoenix to San Diego this year (140k miles on the odometer). The high MPG was 30MPG at 75MPH, which considering my wife and two adult sons were in the car ... seemed pretty good. It's great going to the beach without filling up along the way.
#6
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'15 S550, '10 E350 P1/P2, '02 ML320
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#8
MBWorld Fanatic!
No, just the 91 RON at either Costco or Chevron. I do stick with Top Tier fuel. https://www.toptiergas.com/
#9
Costco Wholesale and Chevron are listed in their list: https://www.toptiergas.com/licensed-brands/
That means they adhere by the fuel quality standards listed there, which means, in theory the fuel should be better than other stations that are not listed.
That means they adhere by the fuel quality standards listed there, which means, in theory the fuel should be better than other stations that are not listed.
#10
MBWorld Fanatic!
Costco Wholesale and Chevron are listed in their list: https://www.toptiergas.com/licensed-brands/
That means they adhere by the fuel quality standards listed there, which means, in theory the fuel should be better than other stations that are not listed.
That means they adhere by the fuel quality standards listed there, which means, in theory the fuel should be better than other stations that are not listed.
I hate when they add the oxygenated stuff to the gas here for the winter. You always get less MPG and it sucks.
#12
MBWorld Fanatic!
Just got 26 mpg on trip to Boston with AC on, that means I'd get more with it OFF. I would think w222 would be similiar. 35 psi in tires. Make sure yours aren't low. To me, that's incredible gas mileage on a NA car!
The owners manual states to use 91 octane minimum, and if you have to use 87, only fill half the tank with 87, until you can fill up with 91 again. Running 87 octane in an S550 is like drinking Sutter Home wine at Morton Steakhouse.
The owners manual states to use 91 octane minimum, and if you have to use 87, only fill half the tank with 87, until you can fill up with 91 again. Running 87 octane in an S550 is like drinking Sutter Home wine at Morton Steakhouse.
#13
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2010 e550 p2
Usually get about 26mpg in my 550. There was a time where i got 27.1.
also its easy to get high mpg if you only drove 10 , 15 , 20.. miles. To say that you get a good mileage and accurate you gotta drive id say at least 50miles , the more the better and more accurate.
also its easy to get high mpg if you only drove 10 , 15 , 20.. miles. To say that you get a good mileage and accurate you gotta drive id say at least 50miles , the more the better and more accurate.
#14
MBWorld Fanatic!
So here's the funny question. I wonder if the NA engine gets better mileage than the Turbo'd one.... The EPA figures for the NA engine on MPG are way off and underestimated for sure. I realized that as soon as I got this car, way off. In a good way.
#15
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'15 S550, '10 E350 P1/P2, '02 ML320
Just for reference on the MPG, I observed 28MPG for the round trip from Phoenix - San Diego - Phoenix, about 700 miles. Keep it running, do ALL the maintenance, keep the tires aired up. Honestly it's an amazing machine.
#16
MBWorld Fanatic!
Well along those lines I was wondering if the direct injection on the M278 (turbo engine) would over time lead to lower MPG due to carbon buildup common with direct injection engines...
Just for reference on the MPG, I observed 28MPG for the round trip from Phoenix - San Diego - Phoenix, about 700 miles. Keep it running, do ALL the maintenance, keep the tires aired up. Honestly it's an amazing machine.
Just for reference on the MPG, I observed 28MPG for the round trip from Phoenix - San Diego - Phoenix, about 700 miles. Keep it running, do ALL the maintenance, keep the tires aired up. Honestly it's an amazing machine.
#17
Just got 26 mpg on trip to Boston with AC on, that means I'd get more with it OFF. I would think w222 would be similiar. 35 psi in tires. Make sure yours aren't low. To me, that's incredible gas mileage on a NA car!
The owners manual states to use 91 octane minimum, and if you have to use 87, only fill half the tank with 87, until you can fill up with 91 again. Running 87 octane in an S550 is like drinking Sutter Home wine at Morton Steakhouse.
The owners manual states to use 91 octane minimum, and if you have to use 87, only fill half the tank with 87, until you can fill up with 91 again. Running 87 octane in an S550 is like drinking Sutter Home wine at Morton Steakhouse.
#18
I think that is OK.
I am not unhappy with that.